Question

The driver of a 1000 kg car is speeding. He loses control and collides with a wall. The car comes to rest from a speed of 40 m/s. The crumple zone of the car absorbed 80 kN of force. How long did it take for the car to come to rest?

Answer 1

Answer:

0.5 sec.

Explanation:

Mass = 1000 kg

u = 40 m/s

v = 0 m/s

Force absorbed = -80 KN = -80000 N

We know that,

F = ma

-80000 = 1000 × a

a = -80000/1000

a = -80 m/s^2

Now we have got the acceleration

v = u + at

0 = 40 + (-80t)

0 = 40 - 80t

-40 = -80t

t = -40/-80

t = 40/80

t = 1/2

t = 0.5 sec

Therefore, the car stopped in 0.5 sec.

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