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```        A CAR STARTS RECTILINEARLY , FIRST WITH ACC. 'W' = 5 M/S2 (THE INTIAL VELOCITY  IS 0), THEN UNIFORMLY,ND DEN DECELARATING AT D SAME RATE COMES TO A STOP. THE TOTAL TIME MOTION EQUALS T = 25S. THE AV. VELOCITY IS 72 KM/H. HOW LONG DOES D CAR MOVE UNFORMLY??

THE PROBLEM IS WHETHER THE ACCELERATION IS UNIFORM OR THE VELOCITY DAT IS WAT IM NOT ABLE TO UNDERSTAND??```
7 years ago

Prudhvi teja
83 Points
```										Dear shashwat
He means you need to find out till what time it went through constant speed.
Take time with constant velocity is t
and with acceleration is t1
so 2t1+t= 25
avg velocity = ((at1)t1+(at1)t)/(2t1+t) = 20m/s
t1(t1+t) = 100
t1(25-t1) = 100
t1=5
t= 15s

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7 years ago
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