A car accelerates uniformly from rest to a speed of 20 m/s over a distance of 100 m on a straight road. What is the acceleration of the car?
Answer and explanation
Correct answer: A. 2.0 m/s^2
Using the kinematic equation v^2 = u^2 + 2as with initial velocity u = 0: (20 m/s)^2 = 0 + 2 a (100 m). This gives 400 = 200 * a, so a = 400 / 200 = 2.0 m/s^2.
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