Question

Find the magnitude of momentum of a body of mass 10kg moving with a velocity of
5m/s.
locs bod
1) 40kgm/s
2) 30kgm/s
C) 50kgm/s
D) 60kgm/s​

Answer 1

For a perfectly elastic collision, coefficient of restitution is e=1.

Let u and v be the velocities of 10 kg and 1 g masses after collision.

Thus, e=
rel. vel. of approach
rel. vel.of separation
​
=
5−0
v−u
​
=
5
v−u
​


But, as e=1, we have v−u=5.

Total momentum before collision is P=10×5=50 kg m/s
Total momentum after collision is P=10×(v−5)+0.001×v=10.001v−50

Thus, 10.001v−50=50⇒v=
10.001
100
​
≈10 m/s

Answer 2

Answer:

option C) 50kgm/s

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