Question

A body of mass m moving with a constant velocity v hits another body of the same mass moving with the same velocity v but in the opposite direction and sticks to it. The velocity of the compound body after collision is

• A. v
• B. 2v
• C. Zero
• D. v/2

Answer 1

Answer: (C)

Zero

Answer 2

Initial momentum of the system = $m v - m v = 0$

As body sticks together ∴ final momentum =

By conservation of momentum $2 m V = 0$∴ V = 0