A car is traveling with a constant speed when the driver suddenly applies the brakes, giving the car a deceleration of 3.50 m/s². The car comes to a stop in a distance of 34.0 m. What was the car's speed when it had traveled 17.0 m from the point where the brakes were applied? A) 10.9 m/s B) 14.5 m/s C) 10.7 m/s D) 21.0 m/s E) 15.3 m/s

Question

Quizplus · Accepted Answer

Using the equation $ v^2 = u^2 + 2as $, where $ v $ is the final velocity (0 m/s when the car stops), $ u $ is the initial velocity, $ a $ is the acceleration (-3.50 m/s²), and $ s $ is the distance (34.0 m), we find the initial speed. Then, using the same equation for 17.0 m, we find the speed at that point.

A Car Is Traveling with a Constant Speed When the Driver