A 25-G Ball Is Released from Rest 80 M Above

question 25

Multiple Choice

A 25-g ball is released from rest 80 m above the surface of the Earth. During the fall the total thermal energy of the ball and air increases by15 J. Just before it hits the surface its speed is

• A) 19 m/s
• B) 36 m/s
• C) 40 m/s
• D) 45 m/s
• E) 53 m/s

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