Medal+Fan
An automobile driver puts on the brakes and decelerates from 30.0m/s to zero with an acceleration of -3m/s/s. What distance does the car travel?

Question

Medal+Fan
An automobile driver puts on the brakes and decelerates from 30.0m/s to zero with an acceleration of -3m/s/s. What distance does the car travel?

surry99 · Answer

look up kinematic equations of motion for constant acceleration

anonymous · Answer

That doesn't help surry.

anonymous · Answer

Use the formula s=ut - 0.5at^2 and v=u-at
Where s is the distance traveled, a is acceleration, t is time , v is final speed, u is initial speed.
So according to the values you have, we need to find time firstle and hence we use v=u-at, having 0=30-3t. t will be equal to 10 seconds. 
Resorting in the first equation, we will have: s= 30(10)-0.5[3(10^2)] giving you 150metres.
Hope it did help.