Question

A bullet weighing 200 gm and moving at 1 m/s strikes a 4 kg block of ice at rest on a friction less surface and drops dead. The speed of the block is

• A. 1/20 m/s
• B. 1/21 m/s
• C. 1/ 54 m/s
• D. 1/25 m/s

Answer 1

Answer: (B)

1/21 m/s

Using momentum conservation for inelastic collisions:
$mu+MU=(m+M)V$
$m=0.2,u=1,M=4,U=0$
$V=0.2/4.2=1/21m/s$