Question
Asked Oct 2, 2019

A boy throws a ball of mass 0.25 kg straight upward
with an initial speed of 20 m/s When the ball returns to the
boy, its speed is 17 m/s How much much work does air
resistance do on the ball during its flight?

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Expert Answer

Step 1

Given Information :

Initial velocity of the ball V1 = 20 m/s

Final Velocity of the ball V2 = 17 m/s

Mass of the ball m = 0.25 kg

When the ball moves against air resistance it will lose some of its energy in moving against air re...

mVmV
Work done by the ball on air resistance
m(V- V
x 0.25 x (202 172)
Work done by the ball on air resistance
Work done by the ball on air resistance
13.875
Work done by air resistance on ball -13.875 J
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mVmV Work done by the ball on air resistance m(V- V x 0.25 x (202 172) Work done by the ball on air resistance Work done by the ball on air resistance 13.875 Work done by air resistance on ball -13.875 J

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Science

Physics

Work,Power and Energy

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