a car of mass 1000kg has a head on collision in a 50km/h(30mph)zone with a truck of mass 2500kg in which both vehicle stop dead. if the truck speed as detected by police radar was 30km/h, what was the car speed and was the law being broken?
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Answer:
the law was broken by the car
Explanation:
mass of car = 1000kg
speed of car = x
mass of truck = 2500kg
speed of truck = 30km/h
both the bodies came to rest after collision.
car's mass,speed = truck's mass,speed
1000×x = 2500 × 30
1000x = 75000
x = 75000
1000
x = 75
therefore the speed of the car was 75km/h.
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