Question

A ball strikes the floor vertically downward with a speed of 5m/s and rebounds with the same speed .the magnitude of its change in velocity will be

Answer 1

Given: A ball strikes the floor vertically downward with a speed of 5 m/s

To find: The magnitude of its change in velocity?

Solution:

• Now we have given that a ball strikes the floor vertically downward with a speed of 5 m/s.

• So let the velocity at instance when it  strikes the ground be v = -5 m/s.

• It also rebounds with the same speed. So the velocity will be: 5 m/s

• Because the direction is opposite.

• Now the change in velocity will be:

               final - initial

               5 - (-5)

               10 m/s

Answer:

         The magnitude of its change in velocity is 10 m/s.