Question

If a car is moving with a speed of 18 km/h suddenly brakes are applied in order to stop the car just before hitting a dog at distance of 300 m. how long will the car take to stop?​

Answer 1

Answer:

0.125m/s2

Explanation:

Using the equaiton of motion

v2−u2=2as …(i)

v=0,u=18km/h=5m/s,S=100m

So, substituting the values in equation (i) we get

Therefore, a=−5×52×100=−18=−0.125m/s2

So, the retardation produced by the brakes is 0.125m/s2.