a bicyclist is moving at a speed of 5.5 m/s. she squeezes the brakes, giving her an acceleration of -2.1 m/s². how fast is the bicyclist going after 0.3 seconds of applying the brakes?
Formula relating time, velocity and acceleration: Vf = Vi + at (Vf = Final velocity, Vi = initial velocity) What you're given: Initial speed, Vi = 5.5 m/s Acceleration, a = -2.1 m/s^2 Time, t = 0.3 s Required: Vf = ? Plugging in the given information: Vf = (5.5) + (-2.1)(0.3) Vf = 4.87 m/s The bicyclist's speed is 4.87 m/s after 0.3 s.