Question

A body of mass `2 kg` is projected with an initial velocity of `5 ms^(-1)` along a rough horizontal table. The work done on the body by the frictional forces before it is brought to rest is
A. 250 J
B. 25 J
C. `-250 J`
D. `-25 J`

Answer 1

Correct Answer - D
`W_(f) = ((1)/(2) mv_(f)^(2) - (1)/(2) m v_(i)^(2))`.