Question

A basketball is rolling with a velocity of 0.5 meters/second relative to the ground and due north. A tennis ball is rolling with a velocity of 0.25 meters/second relative to ground in the same direction of the basketball. Find the velocity of the basketball relative to tennis ball.

Answer 1

0.25 meters/second due north

Step-by-step explanation:

I know it's years late but for anyone else looking for the answer, there it is.

Answer 2

Since the basketball and the tennis ball both travel to the same direction relative to the ground, the velocity of the basketball relative to the tennis ball is therefore the difference of their velocities.
0.5 m/s - 0.25 m/s = 0.25 m/s
Thus, the basketball travel for 0.25 m/s relative to the tennis ball.