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Q.

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 give a velocity of 14 m/s to the heavier block in the direction of the lighter block. The velocity of centre of mass is:

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a

30 m/s

b

20 m/s

c

10 m/s

d

5 m/s

answer is C.

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Detailed Solution

Mvcm = m1v1+m2v2     vcm= 4×0+10×1414   ⇒  vcm = 10 m/s
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