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An athelete takes 2.0 s to reach his maximum speed of 18.0 km/h. What is the magnitude of his average acceleration ?

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Initial velocity u = 0 ( starts from rest)
Final velocity v = 18 km/hr = 5 sec
(i.e. max velocity)
Time interval t = 2 sec.
 Acceleration = aave = v-u/2=5/2 = 2.5 m/s2.

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