Question

2. A car accelerates along a straight road from rest to 90 km/h in 5.0s. What is the magnitude of average acceleration in meters per second squared. 3. If you are driving 110km/h along a straight road and look to the side for 2.0s, how far do you travel during this inattentive period? 4. At highway speeds, a particular car is capable of accelerating at about 1.8m/s?. At this rate, how long does it take to accelerate from 80km/h to 110km/h? 5. A car speeding at 150km/h passes a still police car which immediately takes off in pursuit. Suppose that the speeder continues at the same speed and that police car accelerates at a constan acceleration of 5.6m/s2. How long does it take the police car to catch up with the speeder and at that point, how fast will the police car going?

Answer 1

2.

Initial velocity, u= 0 m/s

Final velocity, v = 90 km/h = 90 × 1000 / 3600 m/s = 25 m/s

Time, t= 5.0 s

Acceleration, a = ( v - u ) / t

a = ( 25 - 0 ) / 5 = 5 m/s²