Question

A highly elastic ball moving at a speed of 3 m/s approaches a massive wall like structure mority towards it with a speed of 3 m/s. After the collision the speed of the ball (in m/s) will be ..

Answer 1

we know that when a lighter particle collides with a much heavier particle at rest the velocity of lighter particle is nearly reversed while the heavier particle remains nearly at rest.

so the velocity of ball after collision = - 3m/s