(a)[3]
Find the car’s change in potential energy over $30\text{ s}$.
(b)[3]
Given that the engine’s total work done in this time is $1960\text{ kJ}$, find the constant force that opposes the motion.
(c)[2]
Calculate, in kW, the power produced by the car engine.
(d)[3]
Find the car’s instantaneous deceleration if this power is reduced suddenly by $15\%$.