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CAIE A-Level Physics 5.2.4 Using Kinetic Energy

Practise calculating kinetic energy, speed or mass with EK = 1/2 mv², converting units and applying energy changes to braking, acceleration and conservation problems.

Syllabus
2028–2030
Course
Physics 9702
Level
AS

Exam points

  • calculate kinetic energy using EK = 1/2 mv², including appropriate unit conversion
  • rearrange EK = 1/2 mv² to determine mass or speed
  • apply kinetic-energy changes in braking, acceleration and conservation-of-energy problems, including comparisons between initial and final states

5.2.4—EK = 1/2 mv2 question 1

[Maximum number: 2]

A block of mass 0.40 kg slides in a straight line with a constant speed of 0.30 m s−10.30 \mathrm{~m} \mathrm{~s}^{-1} along a horizontal surface, as shown in Fig. 3.1.

Fig. 3.1

Fig. 3.1

Assume that there are no resistive forces opposing the motion of the block.
The block hits a spring and decelerates. The speed of the block becomes zero when the compression of the spring is 8.0 cm .

Calculate the initial kinetic energy of the block.
kinetic energy = J

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