Physics
posted by Simi on .
A car starts from rest and travels for 5.0s with a uniform acceleration of +1.5 m/s^2. The driver then applies the brakes, causing a uniform acceleration of 2.0 m/s^2. If the brakes are applied for 3.0 s, how fast is the car going at the end of the braking period, and how far has it gone from its start?

1) find the velocity at the time brakes were applied: Vf=at=7.5m/s
2) then find the final velocity at end of brakeing: Vf=7.52*t
1.5 m/s 
20m