# physics

Before a collision, a 28 kg object is moving at +13 m/s. Find the impulse

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1. Hmmmmm. Impulse is equal to change in momentum. There is no change mentioned here

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2. I think the answer is this:

The change of momentum of a system is equal to the net impulse applied to it. Therefore,

delta p=Fnet*deltat=Impulse

In our case, p initial=mv=28kg*13m/s=364 kg*m/s
p final=0 ( the object stops, v=o, p final 0)

delta p = p final- p initial = 0- 364 = -364 kg*m/s

Hope, that's the right answer.

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posted by Alty

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