A bullet moving with a speed of 200m/s strikes abag of sand & remains in it. the masses of bag& bullet are 4.5kg&500g respectively. If the sand bag is free to move its speed is
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Expert's answer
2012-09-13T10:57:24-0400
Let I be the momentum of the bullet and J be the momentum of a bag striked with it, M and m be mass of the bag and the bullet respectively, V and W velocities of the bullet and the striked bag. Then:
I = mV J = (M+m)W I = J mV = (M+m)W W = mV/(M+m) W = 0.5*200/(4.5+0.5) = 20 m/s.
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