Q.

The particles M1 & M2 and the pulley P are lying on smooth horizontal surface. Initially the string is loose.

Assertion: The particle M1 is projected with a speed V0. Then the particle M2 moves with a velocity (M1V0M1+M2) just after the collision.

Reason: The momentum of system (M1+M2) is conserved along x-direction.

1 Assertion is True, Reason is True; Reason is a Correct explanation for Assertion  
2 Assertion is True, Reason is True; Reason is NOT a Correct explanation for Assertion  
3 Assertion is True, Reason is False  
4 Assertion is False, Reason is True  

Ans.

(3)

Assertion is True, Reason is False as impulse will be imparted by string