Question

A body mass $10kg$ is raised from a certain depth. By the time it is raised by $10m$, If its velocity is $2m{s}^{-1}$, work done during this time is,

• A. $980J$
• B. $20J$
• C. $960J$
• D. $1000J$

Answer 1

The correct option is D $1000J$

Given that,

Mass of body $m=10kg$

Height from depth $h=10m$

Velocity $v=2m/s$

Now,

Work done = work done to change in P.E + work done in providing K.E to body

$W=mgh+\frac{1}{2}m{v}^2$

$W=10\times 9.8\times 10+\frac{1}{2}\times 10\times 2\times 2$

$W=980+20$

$W=1000J$

Hence, the work done is $1000J$