(a)[1]
State the way in which velocity differs from speed.
(b(i))[2]
Calculate the resultant force on the car while it accelerates. The car accelerates at $1.5\,\text{m s}^{-2}$.
(b(ii))[2]
Explain why the forward force on the car from the engine is larger than the value in (b)(i).
(b(iii))[2]
Determine the car’s speed $4.0\,\text{s}$ after it begins to accelerate.