Question

A weightlifter lifts a weight of 500 N from the ground over her head, a distance of 1.8 m. How much work has been done to move the weight?
Please help

Answer 1

Answer:

W= 900 J

Explanation:

$W= F.X$

W=500*1.8

W=900 J

Answer 2

The work done by the person to move the weight is equal to  900N

Explanation:

• If we consider about the work done by the the acceleration due to gravity it is negative because the displacement is done in the opposite direction of that of the force. However if we considered the work done by the person it is equal to 900 Newton. And positive.

• The work done is the dot product of  the force applied and the distance travelled by the body due to the force which has been applied

• Hence work done= 1.8 x 500= 900N

To know if,

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