|

Mechanics

Hot goIITian

 Joined: 25 Jan 2009 Post: 176
24 Oct 2010 17:14:17 IST
0 People liked this
2
353
important qns , rates promised
Engineering Entrance , Medical Entrance , AIPMT , JEE Main , AIIMS , JEE Advanced , Physics , Mechanics , Kinematics , NewtonsLawsCirMotion , Work Power Energy collisions , Rotation , Gravitation , Simple Harmonic Motion , Fluid Mechanics , Materials Wave Sound , Super Position , units dimensions , com momentum , shm , wave sound

a particle is thrown with a velocity 40 m/s  .  if it passes A &B   as shown in the figure at time  t1 =1 sec  &t2 = 3 sec  . the value of   h

ans)  15 m

plzzzz xplain me

rates assured!!

Forum Expert
Joined: 19 Feb 2009
Posts: 1979
24 Oct 2010 17:29:44 IST
2 people liked this

It is very easy....

What you have given...that .

in time t= 1 sec ....ball is at height ....H

again in time t=3 ball is height ....H

Just write the two equation and solve....see..

The velocity responsible to move ball up to height H is the veritcal velocity...which usin(angle) = usin(30) = u/2

Hence vertical velocity = 40/2 = 20m/s

Now   H = ut -1/2(g)(t)^2     { where g is always downward so taken as ...negative )

H = 20 (1) - 5(1) ^2    =   15   ( Put t=1)

H =  20(3) - 5(3)^2  =   15  (put t=3)

Hence the H = 15.....

Blazing goIITian

Joined: 31 Aug 2008
Posts: 982
24 Oct 2010 20:44:45 IST
0 people liked this

WELL IN THAT QUES TOO MCH INFO IS GIVEN ,, U SHUDNT HV GIVEN U..THERE...WE CUD HV DONE THIS WITHOUT U ONLY!!!

 Some HTML allowed. Keep your comments above the belt or risk having them deleted. Signup for a avatar to have your pictures show up by your comment If Members see a thread that violates the Posting Rules, bring it to the attention of the Moderator Team

## For Quick Info

Name

Mobile

E-mail

City

Class

### Find Posts by Topics

Physics

Topics

Mathematics

Chemistry

Biology

Institutes

Parents Corner

Board

Fun Zone

Vertical Limit

Top Contributors
All Time This Month Last Week
1. Bipin Dubey
 Altitude - 16545 m Post - 7958
2. Himanshu
 Altitude - 10925 m Post - 3836
3. Hari Shankar
 Altitude - 9960 m Post - 2185
4. edison
 Altitude - 10815 m Post - 7797
5. Sagar Saxena
 Altitude - 8625 m Post - 8064