A 72kg human sprinter can accelerate from rest to 12m/s in 3.2s . During the sam

Question

A 72kg human sprinter can accelerate from rest to 12m/s in 3.2s . During the same interval, a 33kg greyhound can accelerate from rest to 23m/s . Compute (a) the change in kinetic energy and (b) the average power output for each.

Part A

Express your answer using two significant figures.

?Ksprinter

Part B

Express your answer using two significant figures.

?Kgreyhound

Part C

Express your answer using two significant figures.

Psprinter

Part D

Express your answer using two significant figures.

Pgreyhound

Explanation / Answer

a) the change in kinetic energy human
= 0.5 * 72 * 12^2 -0
= 5184 J --answer

c)average power output
= 5184 / 3.2
= 1620 W --answer

and
b)the change in kinetic greyhound
= 0.5 * 33 * 23^2 -0
= 8728.5 J --answer

d)average power output
= 8728.5 / 3.2
= 2727.65 W --answer

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