A body of mass 5 kg I is placed at the origin . It can move only on the x- axis . A force of 10N is acting on it in a direction making an angle of `60^(@)` with the x - axis and displaces it along the x- axis by 4 meter. The work done by the force is

Options

A. 2.5J
B. 7.25J
C. 40 J
D. 20 J

Answer

D

Explanation

Workdone = Force `xx` displacement along force direction
W = f. x. `cos theta = 10 xx 4 xx cos 60^(@) = 20` J