Question

Three identical blocks A, B and C are placed on horizontal frictionless surface. The block B and C are at rest, A is approaching towards B with a speed of 10 m/s.

Collision between A & B is elastic and between B and C is pure inelastic, then the final speeds of A, B and C are

• A. 0, 5 m/s, 5 m/s
• B. 5 m/s, 5 m/s, 0 m/s
• C. 5 m/s, 0, 5 m/s
• D. 0 m/s, 0 m/s, 10 m/s

Answer 1

The correct option is A 0, 5 m/s, 5 m/s


Given elastic collision between A and B
So after collision, $V_A=0,V_B=10m/s$


Given that collision between B and C is inelastic
So B & C will move together with 5 m/s.