Paper 3 · Work, Energy and Power
A cyclist and bicycle of total mass 69.0 kg move at 5.5 m/s at the top of a rise. Calculate the cyclist's kinetic energy at the top of the rise.
Model answer
1040 J
Also accepted: 1.04 x 10^3 J, 1043 J
Explanation: Ek = (1/2)mv^2 = (1/2) x 69.0 x 5.5^2 = (1/2) x 69.0 x 30.25 is approximately 1.04x10^3 J.
Derived from ZIMSEC Physics Paper 3, November 2004, Q1