An athlete climbs a vertical rope of height 6.0 m four times. The time taken for each climb is recorded. Which time is measured when the athlete's useful power is greatest?
8 s8\text{ s}8 s
12 s12\text{ s}12 s
16 s16\text{ s}16 s
20 s20\text{ s}20 s
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.