Question

A force of 20 N acts on a body and the body moves through 1 m at an angle of 45º to the

direction of force . The work done by the force is :​

Answer 1

$workdone \: is \: f.s$

so f is 20 s is 1m and angle between them is 45

so f.s =f×s×cos(angle between them)

so work done is 20×1×cos45

that is

$20 \times 1 \div \sqrt{2}$