Question

A force of 10n causes a displacement of 2m in a body in its own direction. calculate the work done by force.

Answer 1

w=Force×displacement
w=10×2
w=20Nm

Answer 2

Heya!
$workdone \: = f.d \cos( \alpha ) \\ \\ f \: = 10n \\ d \: = 2m \\ workdone = 10 \times 2 \cos(0) = 20nm$
cos(@) = 0 (•: the displacement is along the direction of force)

Thanks!