What is the speed of the car after the braking?

Question

A driver moving at 25 m/s applies his brakes for 1.5 seconds causing a deceleration of 2.3 m/s2. (Hint: deceleration is just negative acceleration; the sign is important to your calculation.)

Answer 1

v = v_i + at

Initial velocity (v_i) = 25

a = -2.3

t = 1.5

So v = 25 + (-2.3)(1.5) = 25 - 3.45 = 21.55 m/s