A ball (100 g) thrown
20 m/s comes back to ground with speed 10m/s find work done by air resistance
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Explanation:
Work done by air friction + Work done by gravity=Change in kinetic
energy
Work done by gravity is 0 for the total path because gravitational force is conservative in nature.
So,
work by air friction =∆KE
=1/2 X mass of ball X (u^2-v^2)
=1/2 X 0.1kg X(400-100) m^2s^-2
=1/2 X 0.1 X 300 J
=150 X 0.1 J
=15 J
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