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A motorcycle has a constant acceleration of 2.5 m/s2 . Both the velocity and acceleration of the motorcycle point in the same direction. How much time is required for the motorcycle to change its speed from (a) 21 to 31 m/s, and (b) 51 to 61 m/s?

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darwinvillar

Answer:

4 seconds both, due to constant acceleration.

Explanation:

Acceleration is speed change over time as magnitude, then for a) a=(31-21)m/s  / t, then we can calculate t as (31-21)m/s  / a = (31-21)m/s  / 2,5 m/s^2 = 4 seconds. b) a=(61-31)m/s  / t, again t=(61-51)m/s  / a=(61-51)m/s  / 2,5 m/s^2 = 4 seconds.

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