(i)[3]
Determine the total distance covered during the first $40\text{ s}$ of the motion.
(ii)[6]
Once the car has been moving for $20\text{ s}$, a motorcycle begins from rest and speeds up uniformly in a straight line from point $A$ to a speed $V\text{ m s}^{-1}$. It then keeps this speed for $30\text{ s}$ before slowing uniformly to rest at point $B$. The motorcycle stops at the same instant as the car. Given that the size of the acceleration $a\text{ m s}^{-2}$ of the motorcycle is three times the size of its deceleration, find the value of $a$.
(iii)[3]
Draw the displacement-time graph for the car’s motion.