Find the work done by a force as it pushes the body from $x=0$ to $x=10m$ as shown in the figure.

A body of mass $3 \mathrm{kg}$ is under a force which causes a displacement in it given as $s=\frac{t^2}{3}\left(m\right)$.

Find the work done by the force in $2 \mathrm{s}$.

State Newton's $2^{nd}$ law of motion and show how it leads to

(i) Force$=$mass$\times$acceleration.

State Newton's $2^{nd}$ law of motion and show how it leads to

(ii) Show how Newton's $1^{st}$ law follows from $2^{nd}$ law.