An object of mass 5 kg falls from rest

Asked by admin @ 17/08/2021 in Physics viewed by 284 People

An objecte of mass 5 kg falls from rest through a vertical distance of 20 m and reaches velocity 10 m/s. How much work is done by push of air on the object (g=10m/s2)

Answered by admin @ 17/08/2021

From work energy theorem work done by weight + work done by air =ΔKE=ΔKE

Wair=ΔKE−W(weight)Wair=ΔKE−W(weight)

=1/2mv^2−mgh

=1/2×5×(10)^2−5×10×20

=−750J

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