Edexcel IGCSE Physics 1.4 Average Speed Equation Questions

Use average speed = distance ÷ time to solve written and graph-based motion problems, including speed-limit comparisons.

Exam points

State and rearrange average speed = distance ÷ time to find any one of the three quantities.
Calculate speed, distance or time from written values, tables and distance-time graph data.
Convert speed units consistently before comparing a calculated speed with a speed limit.

[Maximum number: 3]

The photograph shows infrared heating lamps being used to harden fresh paint on a car.

Figure for Question Edexcel IGCSE Physics 1.4 Average Speed Equation Questions question 1 — Edexcel IGCSE Physics

The infrared heating lamps are placed 1.5 m from the car.

Calculate the time taken for infrared waves emitted from a lamp to reach the car.

[for infrared waves, speed = 3.0 x 10^8 m/s]

time = ............ s

Marking points:
- substitution into $\text{speed}=\frac{\text{distance}}{\text{time}}$
- rearrangement
- evaluation

Example:
$3.0\times10^{8}=\frac{1.5}{t}$ $t=\frac{1.5}{3.0\times10^{8}}$ $t=5.0\times10^{-9}\ \mathrm{s}$

Accept:
- $5\times10^{-9}\ \mathrm{s}$
- $0.000000005\ \mathrm{s}$

Marking guidance:
- Deduct 1 mark for power-of-ten error.

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Edexcel IGCSE Physics 1.4 Average Speed Equation Questions question 1