Question

A car is travelling at 20 m/s along a road. A child runs out into the road 50 m ahead and the car driver steps on the brake pedal. What must the car's deceleration be if the car is to stop just before it reaches the child ?

Answer 1

Answer:

4m/s^2

Explanation:

by using simple formula of stopping distance -

s=u^2/2a

where s=50m

u=20m/s

a=?

so,

50=(20)^2/2a

a=4m/s^2