An object of mass 10 Kg and another of the same mass collide. Before the collisi

Question

An object of mass 10 Kg and another of the same mass collide. Before the collision the first object is at rest and the second object is moving at 10 meters/second.

1. What is the momentum of the first object before the collision?                    kg m/s

2. What is the momentum of the second object before the collision?             kg m/s

3. What is the total momentum of the objects before the collision?                   kg m/s

4. What is the total momentum of the objects after the collision?                       kg m/s

5.    Assume that the objects stick together. What is the total velocity of the objects after the collision?                   m/s   

Explanation / Answer

1) P1 = m1*u1 = 0

2)P2 = m2*u2 = 10*10 = 100 kg.m/s

3) Pi = P1+P2 = 100 kg.m/s

4) Pi = Pf = 100 kg.m/s

5)

m1*u1 + m2*u2 = (m1+m2)*v

0 + 10*10 = (10+10)*v

==> v = 100/20 = 5 m/s

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