physics

A cyclist is at rest at a traffic light. When the light turns green, he begins accelerating at 2.13 m/s2. How many seconds after the light turns green does he reach a cruising speed of 5.05 m/s?

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  1. v = a t

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  2. Kevin,

    I looked up how to get the solution and came up with the formula v = at as Damon says, with V = velocity, A = Acceleration, and T being time. SO velocity = acceleration x time.

    In our problem, we are give velocity and acceleration, with the unknown being time.

    5.05 = 2.13t

    t= 5.05/2.13

    That division yields 2.37089202, or approximately 2.37 seconds.

    I hope that's right. I used to be a physics expert but that was almost 30 years ago.

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