Question

How much work is done if I hold 490 N weight still above my head 2 m off the ground ?

Answer 1

Answer:

Work done, W = 0 J.

Explanation:

Given data:

Weight, $W = 490 \ \rm N$

Height, $h = 2 \ m$

The work done by a force can be expressed as,

$W = F.d\textrm{cos} \theta$

Here,

W = work done

F = magnitude of applied force

d = displacement

$\theta$ = angle between the applied force and the displacement

Since the weight is still, therefore the magnitude of the displacement is zero.

Hence, the work done by the weight would be zero.