Two blocks of masses 5 kg and 2 kg placed on a frictionless surface are connected by a spring. An externalkick gives a velocity of 14 m/s to the heavier block in the direction of the lighter one. Calculate the velocitygained by the centre of mass.

Two blocks of masses 5 kg and 2 kg placed on a frictionless surface ar

1.	Two blocks of masses 5 kg and 2 kg placed on a frictionless surface are connected by a spring. An externalkick gives a velocity of 14 m/s to the heavier block in the direction of the lighter one. Calculate the velocitygained by the centre of mass.
Answer» <p>momentum of first ball=momentum of second ballm1v1=m2v2514=2V2V2=35m/secvelocity of centre of massvcm=m1v1+m2v2/M1+M2=514+235/752+2510+10=100m/s</p>