Two blocks of masses 5 kg and 2 kg are placed on a frictionless surface and connected by a spring. An external kick gives a velocity of 14 m/s to the heavier block in the direction of lighter one. The magnitudes of velocities of two blocks in the centre of mass frame after the kick are, respectively,
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a
4 m/s, 4 m/s
b
10 m/s, 4 m/s
c
4 m/s, 10 m/s
d
10 m/s, 10 m/s
answer is C.
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Detailed Solution
vCM=5×145+2=10 m/sVelocity of the 5 kg block w.r.t. CM = 14 - 10 = 4 m/s Velocity of the 2 kg block w.r.t. CM =0-10 = -10 m/s
Two blocks of masses 5 kg and 2 kg are placed on a frictionless surface and connected by a spring. An external kick gives a velocity of 14 m/s to the heavier block in the direction of lighter one. The magnitudes of velocities of two blocks in the centre of mass frame after the kick are, respectively,