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2 marksLinear Motion

CSEC Physics · May/June 2007 · Paper 2 · Question 2(b)(i)

A car moves from A towards C with a constant velocity of 30 m s⁻¹. The driver sees an obstruction at C as the car passes A. Due to reaction time, the car travels 27 m at the same velocity to B before brakes are applied. The car then decelerates uniformly to a halt at C, which is 54 m from B.

Calculate the reaction time of the driver.

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Other parts of this question

  1. 2(a)Explain what is meant by the terms 'velocity' and 'acceleration'.[3 marks]
  2. 2(b)(ii)The car takes 3.6 s to travel from B to C. In the space below, draw a velocity-time graph to represent the motion of the car between A and C.[3 marks]
  3. 2(b)(iii)What is the average speed of the car between B and C?[3 marks]
  4. 2(b)(iv)If the mass of the car is 750 kg, find the braking force that slows the car between B and C.[5 marks]

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