a). $85km/hr$ b). $-5km/hr$
Work Step by Step
a). Velocity of the ball relative to the ground = $15+70=85km/hr$ b). Velocity of the ball relative to the car =$85=90=-5km/hr$
You can help us out by revising, improving and updating this answer.Update this answer
After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.