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anirudh1990 (7)

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A bullet is dropped to the ground from the top of a building while another is fired towards the ground from the same building. Neglect air resistance, the acceleration is:
1)greatest for dropped bullet
2)greates for fired bullet
3)same for each
4)depends on how far they are from the ground.
[only one is correct.]
    
sagarbhale (40)

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same for each i guess as they are both under the gravitational influence...the fired one will only have initial velocity and thus will reach the ground faster

am i correct??

tomorrow theres another possibility
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anirudh1990 (7)

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hi Sagar,
i too had the same opinion but they key paper says that it is the (3)rd option. i.e. same for each
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johri_anshuman (1190)

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The 3rd option is correct as the acceleration due to gravity g is the only accleration acting on both the bullets. So their velocities will be different but they always possess the same acceleration.

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sagarbhale (40)

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aniruddh...thats what i said dident i???
SAME FOR BOTH!!!!!

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gautam_agni_sharma (2)

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it wd b the same

manipulate every aspect
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sabnisneil (16)

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its the same..because acc on the body in motion is always g downwards..so it dosnt matter wheather the body is goin up or down..the acc on each boy must remail g i.e the same......ryt anirudh???

names neil.....neil sabnis
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uday_zingtudor (931)

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how come it would be the same when u provide extra velocity to the bullet ?
 
remeber gravitation is the only retarding force
 
but in this case the fired bullet has acquired some velocity and the other has not
 
u may visualize it practically
 
fire a bullet and release the other

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sg_90 (15)

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i think all of u are getting confused between the speeds and the accellerations of the bullet
 
the speeds are different..... accepted
but here we are being asked abt accelleration.
 
 
here accelleration would be the same fr both as gravity the only external force acting onthe bullets

u can ask any query u wan
2 me
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sabnisneil (16)

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i think u day dude...u should again go through wht u hv written
acceletation is change in velocity...and not velocity..

names neil.....neil sabnis
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sagarbhale (40)

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hi neil

uday use the basic defifnition of velocity.....it is CHANGE in velocity upon time and not just velocity

a = dv/dt or in other words a = v-u/t

thus the initial velocity is of no concern with the acceleration
try using the equation with examples mate you'll understand...or simply use deravitives if you know them
 



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vash (30)

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i think it depends on the height. as the bullet is fired it attains a tremendous velocity in a short period of time. that means it has some initial acceleration. as it goes down it adds up to the natural g and keep on increasing till it reaches the ground. as in the second case it's just the 'g'. so it matters on the height from where they are fired. i think i am right, but if i am wrong then spot out my mistakes plzzzzzzzzzzzz........

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kghedriu (2343)

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C'mon, then explain this:
why don't we say that there might be another acceleration provided bcos of the force the gun exerts????????
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sagarbhale (40)

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i did consider that possibility mate...but i don't think the problems means tht..it only means that one bullet has higher  initial velocity and the other has the lower...tths how i interpret the problem...i don know about you guys...

if the force of gun is to be considered then the bullet fired from the gun will obiviously have higher acceleration as it has initial acceleration and it is fired in direction of the gravitational acceleration...the two will add up.

cheers!!

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johri_anshuman (1190)

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