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Th work done in moving a body of mass 4 ...

Th work done in moving a body of mass `4 kg` with uniform velocity of `5 ms^(-1)` for `10` second on a surface of `mu = 0.4 is (take g= 9.8m//s^(2))`

A

`584 J`

B

`784 J`

C

`684 J`

D

`484 J`

Text Solution

Verified by Experts

The correct Answer is:
B
Force to be applied (againnst friction) .
`F = mu mg = 0.4 xx 4 xx 9.8 = 15.68 m//s`
Displacement , `s = vt = 5 xx 10 = 50 m//s`
Work `= Fs = 15.68 xx 50 = 784 J`
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