Question #4d1df

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Answer 1 · 2017-10-25T12:45:10

The acceleration is #0.44m/s^2#

Acceleration is the ratio of the change in velocity of an object to the time required to produce that change:

#a=(Deltav)/(Deltat)#

In this problem, the change in speed was an increase from 20 m/s to 40 m/s - a change of 20 m/s.

It took from 15 s until 60 s to bring about this change, so 45 s elapsed.

Therefore the acceleration is the value of the ratio

#a=(20 m/s)/(45 s) = 0.44 m/s^2#