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1.7 Energy, work and power

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Question 395

An object falls from a height of 4.0 m.

Air resistance can be ignored.

As it hits the ground the object has 480 J of kinetic energy.

What is its mass? (Take g=10 m/s2g = 10\text{ m/s}^2g=10 m/s2)

A

1.2 kg1.2\text{ kg}1.2 kg

B

12 kg12\text{ kg}12 kg

C

48 kg48\text{ kg}48 kg

D

120 kg120\text{ kg}120 kg

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1.7 Energy, work and power Questions

  1. IGCSE
  2. /Physics
  3. /1.7 Energy, work and power

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.

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