Two blocks of masses 8 kg and 4 kg are connected by a spring of negligible mass and placed on a fric

Question

Two blocks of masses 8 kg and 4 kg are connected by a spring of negligible mass and placed on a frictionless horizontal surface. An impulse gives a velocity if $12 \mathrm{~ms}^{-1}$ to the heavier block in the direction of the lighter block. The velocity of the centre of mass is\

Professor PC Thomas Classes · Answer

Originally the center of mass is at rest. By external force, the system is changed\ \ $\mathrm{v}_{	ext {С.M }}=\frac{8 	imes 12+4 	imes 0}{12}=8 \mathrm{~m} / \mathrm{s}$\ The purpose of the spring is not used. It is assumed that the spring has not yet transmitted the force to 4 kg .\