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Answer to Question #72914 in Classical Mechanics for Petar Krstic

Question #72914
On straight road, an object starts moving with starting speed at 0 and acceleration of
a=5 m/s^2, then object starts moving with same speed for a time period t . Then object starts slowing down with a=-5 m/s^2 untill it stops moving. Total moving time is 25 s. Medium speed of whole motion is Vsr=72 km/h. How long the object was moving with constant speed? Find that speed.
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