Question

A car is traveling with a velocity of 65.0 km/h. In the next 15 minutes the car gradually slows down at the end of the 15 minutes the car is traveling at 45.0 km/h what is the average acceleration of the car during the time it slows down?

Answer 1

- 0.006173 m/s²

Explanation:

Given :

Initial Velocity, u = 65km/hr = (65*1000) / 3600 = 18.056 m/s

Final velocity, v = 45 km/ hr = (45*1000) / 3600 = 12.5 m/s

Time at which change in velocity occurred = 15 minutes = 15 * 60 = 900 s

Acceleration = Change in velocity with time

Acceleration = (v - u) / t

Acceleration = (12.5 - 18.056) / 900

Acceleration (deceleration) = - 5.556 / 900

Deceleration = - 0.006173 m/s²