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Question

An object of mass 5 kg falls from rest through a vertical distance of 20 m and reaches a velocity of 10 m/s. How much work is done by the push of the air on the object?
  1. 740 J
  2. 750 J
  3. 770 J
  4. 760 J

A
740 J
B
750 J
C
760 J
D
770 J
Solution
Verified by Toppr

From work energy theorem,

work done by weight + work done by air=ΔKE (change in Kinetic Energy)

Wair=ΔKEW(weight)

=12mv2mgh

=12×5×(10)25×10×20

=750J

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