Answer to Question #226549 in Civil and Environmental Engineering for camille

Question

A car is driving at speed of 80 mph in a circular track with a radius of 1500 ft. The driver applied brake to decelerate the car and after 6 seconds, the speed decreases to half the original speed. What is the acceleration of the car at the instant after the brakes have been applied? At ft/s2

Answer 1

Braking deceleration =(initial velocity-final velocity) time

Initial velocity=80mph

Final velocity =40mph

Time=6 seconds 

Braking deceleration =(80mph-40mph)6 sec

Braking deceleration =(40mph)6 sec

Braking deceleration =(17. 8816 m/s) 6 sec

Braking deceleration =107.28m/s²Â