Question

body moves a distance of 5 m on a smooth horizontal surface under the influence of a force of 20 N. Calculate the work done by the force when (a) the force acts along the horizontal surface and (b) at an angle of 60 degree with the horizontal surface. ​

Answer 1

Answer:

A)100 J . B)50 J

Explanation:Work done is = force.displacement

(note the dot product)

a)work done = 20*5=100J

b) work done = 20cos(60)*5=20*(1/2)*5=50 J