A car starts moving along a line, first with acceleration 
starting from rest, then
uniformly and finally decelerating at the same rate 
and comes to rest. The total time of motion is 25 s. The average speed during the time is 
. How long does particle move uniformly?
Text Solution
Verified by ExpertsThe correct answer is:
D
12. Average velocity 
or 
Solving this equation with 
, we get 
Thus, the particle moved uniformly for 
or 15 s ,
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