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An object of mass 5 kg falls from rest t...

An object of mass 5 kg falls from rest through a vertical distance of `20 m` and attains a velocity of 10 m/s. How much work is done by the resistance of the air on the objrct?
`(g=10m//s^(2))`.

A

`750J`

B

`-750 J`

C

`850 J`

D

`-650 J`

Text Solution

Verified by Experts

The correct Answer is:
B
`W_("mg")+W_("air") = Delta K.E`.
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