A car starts from rest and travels for 5 seconds with a uniform acceleration of 2m/sec^2. The driver then applies the breaks causing a deceleration of 1.5m/sec^2. If the breaks are applied for 4 second, how fast is the car going after the breaking period?

Answer 1

It reaches a speed of 5x2 = 10 m/s after accelerating and then that speed is reduced by 1.5x4 = 6 m/s during deceleration.

10 - 6 = ___ m/s