A child of weight 330N is at point X at the top of a slide. The slide is at the edge of a swimming
pool, as shown in Fig. 3.1.
X
child,
weight 330 N
surface of slide
4.0 m
surface of water
Y
1.1 m
water in
swimming pool
Fig. 3.1 (not to scale)
The child moves from rest to the lowest point of the slide that is a vertical distance of 4.0 m below X.
The child continues moving towards point Y which is at the end of the slide and a vertical distance
of 1.1 m above the lowest point. The kinetic energy of the child at Y is 540 J.

Q: What topic does this question test?

This question tests Work, energy and power in A-Level Physics (syllabus code 9702). It is worth 8 marks.

Q: Which exam paper is this question from?

This question appeared in the Cambridge A-Level Physics May/June 2021 examination, Paper 2 Variant 2 (9702_s21_qp_22.pdf).

Question

A child of weight 330N is at point X at the top of a slide. The slide is at the edge of a swimming
pool, as shown in Fig. 3.1.
X
child,
weight 330 N
surface of slide
4.0 m
surface of water
Y
1.1 m
water in
swimming pool
Fig. 3.1 (not to scale)
The child moves from rest to the lowest point of the slide that is a vertical distance of 4.0 m below X.
The child continues moving towards point Y which is at the end of the slide and a vertical distance
of 1.1 m above the lowest point. The kinetic energy of the child at Y is 540 J.

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