Question

Two blocks of mass 10 kg and 4 kg are connected by a spring of negligible mass and placed on a frictionless horizontal surface. An impulse gives a velocity of 14m/s to the heavier block in the direction of the lighter block. The velocity of the centre of mass is : (a) 30m/s (b) 20m/s (c) 10 m/s (d) 5 m/s

Answer 1

Velocity of centre of mass = m1v1 + m2v2 / m1+m2
= 10(14)+4(0)/10+4 = 10*14/14 = 10 m/s

Therefore the centre of mass velocity = 10 m/s
Option C

Answer 2

hey!! good morning!!

option c is ans