Question

URGENT ASAP 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

0.5 secs

Step-by-step explanation:

F = m( v - u) /t

Mass m = 1000kg

Velocity v = 40m/s because it came to rest

time t = ?

Force = 80kN

= 80 x 1000 = 80000N

Therefore,

80000 = 1000 x 40 /t

Cross multiply

t x 80000 = 40000

Divide both sides by 80000

t = 40000/80000

t = 0.5 secs