Question

Figure shows seven identical blocks kept equidistant on a frictionless floor. Initially, blocks a and b are moving right ward and block g is moving leftward, each with speed v = 3m/s. The other blocks are stationary. A series of perfectly elastic collisions occur. After the last collision the speed and direction of motion of

• A. A will be at rest
• B. D will be 1.5m/s towards left
• C. F will be at rest
• D. G will be 3 m/s towards right.

Answer 1

The correct option is D G will be 3 m/s towards right.

From conservation of momentum and elastic transfer last bodies f and g move with speed 3m/s
A moves back with speed 3 m/s . rest all will be at rest.