Question

Two blocks of masses 10 kg and 4 kg 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
A. `30ms^(-1)`
B. `20ms^(-1)`
C. `10ms^(-1)`
D. `5ms^(-1)`

Answer 1

Correct Answer - C
Velocity of center of mass,
`v_(CM) = (10(14)+4(0))/(10 +4) = 10 ms^(-1)`