A car starts from rest and travels for 5.0 s with a steady acceleration of magnitude 1.5 m/s2. the driver then applies the brakes for 3.0 seconds causing a steady deceleration of magnitude 2.0 m/s2. How fast is the car going at the end of the breaking period?

Answer 1

V1 = a*t = 1.5 * 5 = 7.5 m/s.

V2 = V1 + a*t = 7.5 - 2*3 = 1.5 m/s.