Question

A 10gm bullet moving directly upward at 1000 m/s strikes and passes through the center of mass of a 10 kg block initially at rest .The bullet emerges from the block moving directly upward at 400 m/s. What will be velocity of the block just after the bullet comes out of it ?

(A) 0.6 m/s 

(B) 1 m/s 

(C) 0.4 m/s 

(D) 1.4 m/s

Answer 1

Correct option (A ) 0.6 m /s 

Explanation:

By momentum conservation

(10 x 10^-3 )1000= (10 x10^-3 ) x 400 +10v

⇒ v 0.6m /s