Question

A bullet strikes a wooden block resting on a frictionless horizontal surface and stops in it. Later the combined system moves. In this case:
i) only KE is conserved
ii) only momentum is conserved
iii) Both KE and momentum are conserved

• A. i) is correct
• B. iii) is correct
• C. i) and (iii) are incorrect
• D. (ii) is correct

Answer 1

Answer: (D)

(ii) is correct

1) K.E won't be conserved because when bullet will enter the block these will be non - conservation fraction at force acting on it.
2) Momentum will be conserved since there is no external force