A speedboat is moving across a straight stretch of water. The speedboat has 1.2 MJ1.2\text{ MJ}1.2 MJ of kinetic energy. It accelerates for 25 s until its kinetic energy increases to 3.0 MJ3.0\text{ MJ}3.0 MJ.
What is the minimum average power developed by the speedboat's engine during this acceleration?
72 W72\text{ W}72 W
168 W168\text{ W}168 W
72 kW72\text{ kW}72 kW
168 kW168\text{ kW}168 kW
95 exam-style questions on CIE IGCSE Physics 1.7.4 Power. Each one has a worked solution and a mark scheme showing where the marks go.