an 1100kg car travels on a straight highway with a speed of 30 m/s. The driver sees a red light ahead and applies her brakes, which exert a constant braking force of 4 kN. Find the time needed to stop the car.

answer:

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Explanation:

40.425m/s

Explanation:

at some point the velocity of the ball will reach 0 so we can say that Vf=0

then we have to divide the total time by 2 for upward and down ward motion of the ball which gives us 8.25s/2=4.125s

now the given are

g=9.8m/s^2

t=4.125s

Vf=0

for the formula of initial velocity

Vi=Vf-a*t

Vi=0-(4.125s)(9.8m/s^2)

Vi=40.425m/s