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OLga [1]
3 years ago
10

The driver of a car slams on the brakes, causing the car to

Physics
1 answer:
zubka84 [21]3 years ago
5 0

It takes 4.58 seconds for the car to stop and the initial speed of the car is 77.14 ft/s

<u>Explanation:</u>

Given:

Acceleration, a = -17 ft/s²

Distance, s  = 175 ft

Final velocity, v = 0

Time, t = ?

Initial speed, u = ?

We know:

v² - u² = 2as

(0)² - (u)² = 2 X - 17 X 175

u² = 5950

u = 77.14 ft/s

To calculate time:

v = u + at

0 = 77.14 - 17 X t

17t = 77.14

t = 4.58 sec

Therefore, It takes 4.58 seconds for the car to stop and the initial speed of the car is 77.14 ft/s

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