Physics 0625 · IGCSE · Motion

Motion — practice question

A rocket is fired straight up from the ground. It moves with uniform acceleration starting from rest. After 8.0 s, its speed is 120 m/s.
(a)[2]

Calculate the rocket’s acceleration.

(b(i))[1]

On Fig. 1.1, draw the graph showing the rocket’s motion during the first 8.0 s.

(b(ii))[2]

Use the graph to work out the rocket’s height at 8.0 s.

(b(iii))[3]

From time = 8.0 s to time = 20.0 s, the rocket moves faster and faster but with a smaller and smaller acceleration. From time = 20.0 s to time = 25.0 s, it travels at a constant speed of less than 200 m/s. On Fig. 1.1, draw the graph for this motion.

Worked solution & mark scheme

This 8-mark question has a full step-by-step worked solution and mark scheme. One marking point: a = \Delta v / \Delta t (any valid form) OR a = 120 / 8

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