A27.0 g marble sliding to the right at 56.8 cm/s overtakes and collides elastically with a 13.5 g marble moving in the same direction at 14.2 cm/s. after the collision, the 13.5 g marble moves to the right at 71 cm/s. find the velocity of the 27.0 g marble after the collision.

Explanation:

Given

mass of marble

velocity of marble

mass of second marble

Velocity of second marble

After collision 13.5 gm marble moves to the right  at i.e.

Conserving momentum

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.

i think the answer is a and b

i wish you luck