Question

8. The brakes applied to a car produces an acceleration of 5 m/sec sq , in the opposite direction of motion . If the car takes 2 sec to stop after the application of brakes, what is the distance it travels during this time ? *

Answer 1

8. The brakes applied to a car produces an acceleration of 5 m/sec sq , in the opposite direction of motion . If the car takes 2 sec to stop after the application of brakes, what is the distance it travels during this time ? *

Answer 2

Answer:

Acceleration a = -6 m/s^2

Time t = 2 s

Final velocity v = 0 m/s

Let initial velocity be u

Let distance be s

v = u + at

So, 0 = u + (-6)(2)

So, u = 12 m/s

Now, s = ut + (1/2) at^2

So, s = 12(2) + (1/2)(-6)(2^2)

So, s = 24 - 12

So, s = 12 m

Thus, distance travelled is 12 m