An object, initially at rest, is dropped from a height of 15.0 m. The change in gravitational potential energy when it falls to the ground is 750 J.
The frictional forces are negligible.
What is its speed when it hits the ground?
5.10 m s−15.10\text{ m s}^{-1}5.10 m s−1
17.2 m s−117.2\text{ m s}^{-1}17.2 m s−1
50.0 m s−150.0\text{ m s}^{-1}50.0 m s−1
294 m s−1294\text{ m s}^{-1}294 m s−1
533 exam-style questions on CIE IGCSE Physics 1.7 Energy, work and power, covering 1.7.1a Energy stores and energy transfers, 1.7.1b Conservation of energy, 1.7.1c Kinetic and gravitational potential energy, 1.7.2 Work done, 1.7.3 Energy resources, 1.7.3a Energy resources and electricity generation, 1.7.3b Nuclear fusion as an energy source, 1.7.3c Efficiency of energy transfer, and 1.7.4 Power. Each one has a worked solution and a mark scheme showing where the marks go.