An auto, starting from rest, undergoes constant acceleration and covers a distance of 1200 meters. the final speed of the auto is 60 meters/sec. how long does it take the car to cover the 1200 meters?

It will take 40 sec

Explanation:

We have given that auto is starting from rest so initial velocity u = 0 m/sec

And final velocity is given as v = 60 m/sec

Distance traveled by car s = 1200 m

According third equation of motion we know that

So

Now according to first equation of motion v = u+at

So

t = 40 sec

real, smaller and upside-down.   so the answer should be b.

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