Question

you are driving your car and the traffic light ahead turns red. you apply the brakes for 3.0 s, and the velocity of the car decreases to 4.5 m/s. if the car's deceleration has a magnitude of 2.7 m/s2 what is the car's displacement during this time?

Answer 1

1.35 m

Step-by-step explanation:

t = 3 s

u = 4.5 m/s

a = - 2.7 m/s^2

Let the displacement of the car in time t = 3 s is s.

Use second equation of motion

`s=ut+(1)/(2)at^2`

`s=4.5 * 3-(1)/(2)* 2.7 * 3 * 3`

s = 1.35 m

Thus, the displacement of car in time 3 s is 1.35 m.