Question

a car is traveling at 104 km/h when the driver sees an accident 80 m ahead and slams on the brakes. what minimum constant deceleration is required to stop the car in time to avoid a pileup? (round your answer to two decimal places.)

Answer 1

below

Step-by-step explanation:

104 km/hr = 104 000 / 3600 = 28.889 m/s

average velocity = 28.9 / 2 = 14.44 m/s

80 m / 14.4 m/s = 5.538 seconds to stop

vf = 0 = vo + at

= 28.9 + a (5.538) shows a = - 5.22 m/s^2