Question

A person picks up an object of mass 20kg.to the height of 3m.Calculate the work done by h on that object .(g =9.8m/sec2).

Answer 1

Mass of the object m =20kg.
Displacement S= 3m.
Force F= mg
F=20kg×9.8m/sec2
= 196 N
Work Done W= F×S
= 196N×3m
=588J
Hence,the work done by him on that object is 588J.

Answer 2

Given:-

Mass (m) = 20 kg
Height (s) = 3 m
Gravitational acceleration (g) = 9.8 m/sec²

Force = m*a
= m*g
= 20*9.8
= 196 kgm/s²
= 196 N

Work done = Force*displacement
= F*s
= 196*3
= 588 J Ans.

Ans.) The work done by that object is 588 Joule.