question_answer

A child pulls a toy car through a distance of 1 Om on a smooth horizontal floor. The string held in the child's hand makes an angle of \[\text{6}0{}^\circ \] with the horizontal surface. If the force applied by the child be 5N, calculate the work done by the child in pulling the toy car.

Answer:

\[S=10\,m\] \[a=60{}^\circ \] \[F=5\,N\] \[w=?\] \[W=FS\,\,\cos \theta \]                 \[=5\times 10\times \cos \,\,60{}^\circ \]                 \[=5\times 10\times \frac{1}{2}=25\,J\]