Question 60 of 175 in Energy Resources and Energy Transfers

Kinetic energy, ke

3 marks · Normal

A football of mass 0.45 kg is moving at 12 m/s towards a goal.

(a)

Calculate its kinetic energy.

[3 marks]

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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

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