m=1200kg, $V_1$= $10m{s}^{-1}$ $V_2$ = $15m{s}^{-1}$, w= ?

work=►K.E = $K.E_2$ = $K.E_2$ - $K.E_1$

⇒work= $\frac{1}{2}m{v}_2^2-\frac{1}{2}m{v}_1^2$

⇒work= $\frac{1}{2}m(v_2^2-v_1^2$)

⇒work= $\frac{1}{2}\times 1200\times ({15}^2-{10}^2)$

⇒work = 600 × (225 -100)

⇒work= 600 × 125

⇒work= 7.5×${10}^{4}j$