The driver of a 1000 kg car is speeding. He loses control and collides with a wall, coming to a stop.
The crumple zone of the car absorbed 90 kN of force in 0.5 seconds. What was the car's speed at the
time of impact?



Answer :

45 m/s is the car's speed at the time of impact.

m=1000 kg

F=90 kN= 90000 N

T= 0.5 seconds

F=mv/t

v=Ft/m

v=90000×0.5  ÷1000

V=45 m/s

Speed is a scalar variable that expresses how much an object's location varies over time or how much it moves per unit of time. It is frequently abbreviated as "s."

The distance traveled by an object during a period of time divided by the length of the period gives the average speed of the object throughout that period.

The speed-related measures are time divided by distance. The most prevalent unit of speed in daily life is the kilometer per hour (kph), but the SI measure of speed is the meter per second (m/s).

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