O-LevelPhysicsKinematics5054/11 · May/June 2011 · Q41 Mark
A car accelerates from traffic lights for 10 s. It stays at a steady speed for 20 s and then brakes to a stop in 3s. Which graph shows the journey?
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Aspeed-time graph showing initial linear acceleration, followed by a period of constant speed, then a period of linear deceleration.
Bspeed-time graph showing initial smooth acceleration, followed by a period of constant speed, then a period of smooth deceleration.
Cspeed-time graph showing initial linear acceleration, followed by a period of constant speed, then an instantaneous drop to zero speed.
Dspeed-time graph showing initial smooth acceleration, followed by a period of smooth deceleration without a constant speed phase.
✓ Correct answer
B: speed-time graph showing initial smooth acceleration, followed by a period of constant speed, then a period of smooth deceleration.
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