Question

A boy pulls the string of a toy car horizontally by exerting a force of 7 n. If the car is displaced by 1.5 m, calculate the work done by a body

Answer 1

Work = Force * dislpacement * cosine angle
= 7 * 1.5 * cos60 degree
= 7* 1.5* 1/2
= 5.25 J.

Answer 2

The work done by a body is 10.5 joules.

Explanation:

It is given that,

A boy pulls the string of a toy car horizontally by exerting a force of 7 N, F = 7 N

Displacement of the car, d = 1.5 m

We need to find the work done by a body. It is given by the product of force and displacement. It is given by :

$W=F\times d$

$W=7\ N\times 1.5\ m$

W = 10.5 Joules

So, the work done by a body is 10.5 joules. Hence, this is the required solution.

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