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1.7 Energy, work and power

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Question 248

A parcel of mass 2.5 kg is dropped from a height of 60 m. As it falls, 20% of its initial gravitational potential energy is transferred to thermal energy.

Taking the acceleration due to gravity as g=9.8 m/s2g = 9.8\text{ m/s}^2g=9.8 m/s2, what is the kinetic energy of the parcel just before it hits the ground?

A

294 J294\text{ J}294 J

B

1176 J1176\text{ J}1176 J

C

1470 J1470\text{ J}1470 J

D

1500 J1500\text{ J}1500 J

Markscheme

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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