Question

What is work done in lifting a body of mass $20$ kg at a height of $2$m above the ground? $(g=10m/s^2)$

Answer 1

Work done to lift an object at a height above earth surface is given by formula,

$W=mgh$,

where

$m=20kg$ = mass of object,

$h=2m$ = height

On putting values, we get

$W=20\times 10\times 2=400Joule$