Question

A car travelling with a speed 126 KMPH along
a straight line comes to rest after travelling a
distance 245 m. The time taken by the car to
come to rest, in second it
​

Answer 1

initial speed of the car is

v_i = 126 km/h = 35 m/s

finally car will stop after it covered d = 245 m

v_f =  0

d = 245 m

now by kinematics

d = \frac{v_i + v_f}{2}*t

245 = \frac{35 + 0}{2}* t

t = 14 s

so it will take 14 s to stop

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