Answer
$240s$
Work Step by Step
We calculate the relative velocities :-
$v_{down}=7.5+5=12.5m/s$
$v_{up}=7.5-5=2.5m/s$
The times taken are $\frac{500}{12.5}=40s$ & $\frac{500}{2.5}=200s$
So, total time taken = $240s$
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: 73
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