Author Question: A 0.04-kg ball is thrown from the top of a 30-m tall building (point A) at an unknown angle above ... (Read 238 times)

xclash · **on:** Aug 1, 2020

Question 1

While running, a person dissipates about 0.6 J of mechanical energy per step per kilogram of body mass. If a 60-kg person runs with a power of 70 Watts during a race, how fast is the person running? Assume a running step is 1.5 m long.

Question 2

A 0.04-kg ball is thrown from the top of a 30-m tall building (point A) at an unknown angle above the horizontal. As shown in the figure, the ball attains a maximum height of 10 m above the top of the building before striking the ground at point B. If air resistance is negligible, what is the value of the kinetic energy of the ball at B minus the kinetic energy of the ball at A (K_B− K_A)?

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12 J

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−12 J

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20 J

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−20 J

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32 J

Ddddd · **Reply #1 on:** Aug 1, 2020

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