CAIE IGCSE Physics 1.2.1 Speed As Distance Travelled Per Unit Questions

Practise using speed, distance and time relationships to solve motion calculations and interpret average speed in Cambridge IGCSE Physics problems.

Exam points

Use speed, distance and time relationships to solve straightforward motion calculations and interpret average speed.

[Maximum number: 3]

Fig. 1.1 shows a straight section of a river where the water is flowing from right to left at a speed of $0.54 \mathrm{~m} / \mathrm{s}$ .

Fig. 1.1 (not to scale)

A swimmer starts at point P and swims at a constant speed of $0.72 \mathrm{~m} / \mathrm{s}$ relative to the water and at right angles to the current.

After 1.5 minutes, the swimmer reaches point Q.

Calculate the distance between P and Q.
distance =

(distance $=) 81 \mathrm{~m}$ $v=s / t \mathbf{O R}(s=) v t \mathbf{O R}(s=) 0.9(0) \times 90$
(time =) $1.5 \times 60(=90)$ OR (time =) 90

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CAIE IGCSE Physics 1.2.1 Speed As Distance Travelled Per Unit Questions question 1