Question

Solve the following problems.
(a) A force of 1000 N was applied to stop a car that was moving with a constant velocity. The car stopped after moving through 10 m. How much is the work done?
(b) A cart with mass 20 kg went 50 m in a straight line on a plain and smooth road when a force of 2 N was applied to it. How much work was done by the force?

Answer 1

(a) $\mathrm{Work}\mathrm{done}\mathrm{by}\mathrm{the}\mathrm{force}\mathrm{to}\mathrm{stop}\mathrm{the}\mathrm{car}=F\times S=1000\times 10=10000\mathrm{J}$

(b) $\mathrm{Work}\mathrm{done}\mathrm{by}\mathrm{the}\mathrm{force}=F\times S=2\times 50=100\mathrm{J}$