A body of mass 2 kg is dropped from a height of 20m. It hits the ground in 3s. If g=10m/s*s, what is the force that air resistance offers to this object?
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work done by air =ΔKE=ΔKE
Wair=ΔKE−W(weight)Wair=ΔKE−W(weight)
=12=12mv2−mghmv2−mgh
=12=12×5×(10)2−5×10×20×5×(10)2−5×10×20
=−750J
Wair=ΔKE−W(weight)Wair=ΔKE−W(weight)
=12=12mv2−mghmv2−mgh
=12=12×5×(10)2−5×10×20×5×(10)2−5×10×20
=−750J
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