A skier starts from rest on one side of a valley and moves down a smooth slope to a short strip of rough snow. The skier crosses the strip and moves up a second smooth slope, coming to rest at a vertical height of 0.648 m above the strip. Friction acts only on the rough strip, and air resistance is negligible. The ratio of the skier's speed immediately after crossing the strip to the speed immediately before reaching it is 0.60:10.60:10.60:1. Which of the following is the skier's starting vertical height above the strip?
0.233 m0.233\ \mathrm{m}0.233 m
1.08 m1.08\ \mathrm{m}1.08 m
0.389 m0.389\ \mathrm{m}0.389 m
1.80 m1.80\ \mathrm{m}1.80 m
121 exam-style questions on Edexcel GCSE Physics 3.1 Energy stores and calculations, covering 3.1.1 Gravitational potential energy, 3.1.2 Kinetic energy, and 3.1.3 Energy transfers and conservation of energy. Each one has a worked solution and a mark scheme showing where the marks go.