Kinetic energy, ke
3 marks · NormalA football of mass 0.45 kg is moving at 12 m/s towards a goal.
(a)[3 marks]
Calculate its kinetic energy.
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32.4 J (±0.2)
Also accept: 32 J; 32.4 Joules
Common mistakes: Not squaring the speed; Omitting 1/2 factor
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Marking points
M1 (a) · 1 mark · KE equation and substitution
M2 (a) · 1 mark · Squaring velocity correctly
A1 (a) · 1 mark · Correct final value and units
Worked solution
KE = (1/2)mv^2