Question

A car initially at rest accelerates uniformly to a speed of
144 km h-' over a distance of 400 m. The time taken is
(1) 55
(2) 10 s
(3) 155
(4) 205​

Answer 1

Answer:

Time taken is 10 seconds.

Refer to the attachment for your answer.

Answer 2

Given :-

The initial speed of car is 144 km/h

Distance covered by car 400 m

To Find :-

Time Taken by the car to covered the distance

Solution :-

Speed = 144 km/h = 144 × 5/18 = 40 m/s

Distance (s) = 400 m

Time (t) = ?

v = s / t

t = v / s

t = 400 / 40

t = 10 sec

Therefore time taken by the car is 10 sec [ Option (2) ]