A damaged 1200 -kg car is being towed by a truck. Neglecting the friction, air drag, and rolling resistance, determine the extra power required $(a)$ for constant velocity on a level road, $(b)$ for constant velocity of $50 \mathrm{~km} / \mathrm{h}$ on a $30^{\circ}$ (from horizontal) uphill road, and $(c)$ to accelerate on a level road from stop to $90 \mathrm{~km} / \mathrm{h}$ in $12 \mathrm{~s}$.