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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 object?
`(g=10m//s^(2))`.

A

`350 J`

B

`750 J`

C

`200 J`

D

`300 J`

Text Solution

Verified by Experts

The correct Answer is:
B
Using work energy theorem
`W_(g) +W_(F)=K_(f) -K_("ini")`
`rArr 1000 + W_(F) = 250`
`W_(F) = -750 J`
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