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 Joined: 21 May 2010 Post: 2
24 May 2010 09:12:54 IST
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A 40 kg shell is flying at a speed of 72 km/h.it explodes into two pieces,one piece of mass 15 k
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A 40 kg shell is flying at a speed of 72 km/h.it explodes into two pieces,one piece of mass 15 kg stops.calculate the velocity of the other piece.

#### Comments (1)

Blazing goIITian

Joined: 15 Nov 2009
Posts: 608
24 May 2010 19:45:42 IST
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Initial velocity(u)=72kmph=20mps

initial momentum= m*u = (40*20)kg mps = 800kgmps

momentum of the 15kg mass=0

From coservation of energy,

initial momentum = total final momentum

thus momentum of the other piece=800kgmps

thus the speed of the other piece of  mass 25kg= 800/25 mps = 32mps

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