Two athletes jump straight up. John has twice the initial speed of Harry. Compared to Harry, John jumps
A) 0.50 times as long.
B) 1.41 times as long.
C) twice as long.
D) three times as long.
E) four times as long.

Question

Quizplus · Accepted Answer

The time of flight for a vertical jump is proportional to the initial speed. Since John has twice the initial speed of Harry, he will stay in the air four times as long because time is proportional to the square of the speed (t ∝ v^2).

Two Athletes Jump Straight Up