Question

A driver of a car traveling at 25 m/s applies the brake, causing a uniform acceleration of -3 m/s2. A) How long does it take the car to accelerate to a final speed of 20 m/s? B) How far has the car moved during the braking period?

Answer 1

T= final velocity- initial velocity/ acceleration
T= 20m/s - 25 m/s / -3m/s^2
T= -5/ -3
T= 1.67 s
Therefore, it takes the car 1.67s to accelerate to a final speed of 20m/s.