Two blocks of masses 10 kg and 4kg are connected by a spring of negligible mass and placed on a frictionless horizontal surface. An impulse gives a velocity of 14 m/s to the heavier block in the direction of the lighter block. The velocity of the centre of mass is

Options

A. 30 m/s
B. 20 m/s
C. 10 m/s
D. 5 m/s

Answer

C

Explanation

`v_(CM)=(m_1v_1+m_2v_2)/(m_1+m_2)=(10xx14+4xx0)/(10+4)=140/14=10m//s `