Question

a car starts from rest and accelerates at uniform rate f 5m/s2 for sometime, then moves with a constant speed for some time and retards at the same uniform rate and comes to rest. Total time of journey is 25s and average speed for journey is 20m/sec. How long does the car move with constant speed?

Answer 1

Use equations of 1d kinematics.
Solution is in the attachment.

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