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An athelete takes 2.0 s to reach his maximum speed of 18.0 km/h

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asked Mar 29, 2018 in Science by Golu (37,045 points) ● 19 ● 145 ● 414

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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answered Mar 29, 2018 by BISHNU (15,580 points) ● 4 ● 4 ● 5
selected Mar 29, 2018 by Vikash Kumar
 
Best answer

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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