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?

Question

Physics

Haley Cowan

16 May, 10:26

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?

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Answers (1)

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Yasmin Mcgee · Answer 1

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.