Answer
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 =$85=90=-5km/hr$
College Physics (7th Edition)
by Wilson, Jerry D.; Buffa, Anthony J.; Lou, Bo
Published by
Pearson
ISBN 10:
0-32160-183-1
ISBN 13:
978-0-32160-183-4
Chapter 3 - Motion in Two Dimensions - Learning Path Questions and Exercises - Exercises - Page 101: 72
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