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Mechanics

Cool goIITian

 Joined: 29 Mar 2012 Post: 50
31 Mar 2012 13:12:44 IST
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if a ball is thrown westwards at 140 kmph from a train moving eastwards at 80 kmph, wha
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if a ball is thrown  westwards at 140 kmph  from a train moving eastwards at 80 kmph, what will be the speedof the ball?

Cool goIITian

Joined: 31 Mar 2012
Posts: 81
31 Mar 2012 19:22:17 IST
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due to inertia ball will have velocity same a train i.e.80 kmph eastwards and due to throwing westwards at 140 kmph it will have 140 kmph velocity west wards so taking components ball will have 60 kmph westwards

Blazing goIITian

Joined: 21 Mar 2012
Posts: 1457
31 Mar 2012 19:30:52 IST
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what is sppedd or the velocity

Cool goIITian

Joined: 31 Mar 2012
Posts: 81
31 Mar 2012 19:32:00 IST
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sppedd??? wats this?

Forum Expert
Joined: 1 Jun 2009
Posts: 1331
1 Apr 2012 00:24:17 IST
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taking east as +ve

Given :

velocity of train (say u )= 80 i

and velocity of ball be v

case 1:

the velocity of ball given is wrt train..

then velocity of ball = -140 i wrt train.

velocity of ball wrt train = v - u

thrfr,

-140 = v - 80

v = -60 i

thrfr the velocity of ball wrt ground = 60 km/hr westward..

Cool goIITian

Joined: 21 Mar 2012
Posts: 37
1 Apr 2012 08:54:11 IST
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60 kmphr westwards

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