1.

Two blocks of masses 5 kg and 2 kg are placed ona frictionless surface and connected by a spring.An external kick gives a velocity of 14 m/sec to theheavier block in the direction of lighter one. Thevelocity gained by the centre of mass is(A) 14 m s1(C) 12 m s-1(B) 7 m s-I(D) 10 m s1

Answer»

Vcm = m1V1 +m2v2/(m1+m2) = (5*14+2*0)/(5+2) = 70/7 = 10 m/s

why v2 is 0?

because its not given any velocity , simple.



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