A ball (100 qm) thrown from ground with speed
20 m/s comes back to the ground with speed
10 m/s. Find the work done by air resistance.
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Answer:
-15J
Explanation:
work done by all the forces will equal to change in kinetic energy.
only two forces are working on body
1.gravitational force
2.air friction.
but work done by gravity will be zero in a round trip
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