A driver who is moving at 15 m/s, sees a stop light and puts on the brakes 30 m before an intersection. a) What acceleration will the driver have to have to stop before entering the intersection?

b) How much time will it take to stop the car?

Hi there!

We can use the kinematic equation:

vf = final velocity (0 m/s)

vi = initial velocity (15 m/s)

a = acceleration due to breaking (? m/s²)

d = displacement (30 m)

We can plug in the given values:

Solve:

To solve for the time taken, we can use the following:

Plug in the values:

answer; i believe the correct answer is (40,000 j) good luck