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CAIE IGCSE Physics 1.2.6 Speed From the Gradient of a Questions

Practise using distance-time graph gradients to determine instantaneous speed and calculating average speed from motion graphs in Cambridge IGCSE Physics problems.

Syllabus
2026–2028
Course
Physics 0625

Exam points

  • Use the gradient of a distance-time graph to determine speed and read speeds or average speeds from motion graphs.

CAIE IGCSE Physics 1.2.6 Speed From the Gradient of a Questions question 1

[Maximum number: 3]

A car of mass m is travelling along a straight, horizontal road at a constant speed v.
At time t=0, the driver of the car sees an obstruction in the road ahead of the car and applies the brakes.

The car does not begin to decelerate at t=0.

Question (a)

(a)

Fig. 1.1 is the distance-time graph for the car from t=0.

Fig. 1.1

Fig. 1.1

[ 3 ]

Question (i)

(i)

State the property of a distance-time graph that corresponds to speed.

[ 1 ]

Question (ii)

(ii)

Using Fig. 1.1, determine the initial speed v of the car.

v=
[ 2 ]
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