Question

While you are driving at a constant speed of 30 mph (or 44 ft/s), what distance do you travel if it took you 0.8 s to realize that you have to slam on the brakes to avoid hitting a person that runs onto the road in front of you?

Answer 1

`d>10.72896\ m`

Step-by-step explanation:

Given:

• initial speed of the car,
  `u=30\ mph=13.4112\ m.s^(-1)`

• time taken to realize the need of braking,
  `t=0.8\ s`

Distance travelled during the time span:

`d=u.t`

`d=13.4112* 0.8`

`d=10.72896\ m`

Actually the distance travelled before stopping the car will be greater than this distance, because after the application of brakes the car will take some time to come to rest.