7.Police suspect that a van was breaking the speed limit when it collided with a parked car. Investigations provided them with the following data: mass of parked car = 800 kg, mass of van = 1000 kg, velocity of car after collision = 5 m/s, velocity of van after collision = 11 m/s
Show whether the van was breaking the 30 mph speed limit (equivalent to 13 m/s).
8.A dodgem car of mass 200 kg moves with a velocity of 3 m/s. The moving dodgem collides with a stationary one of mass 180 kg.
After the collision, the 200 kg dodgem continues to move in the same direction at a speed of 1 m/s.
Calculate the speed v with which the 180 kg (second) dodgem moves to the right after the collision.
1
Expert's answer
2021-05-16T17:59:04-0400
7.
van:
m1=1000;u1−?;v1=11
car:
m2=800;u2=0;v2=5
u1,u2pre-collision speed
v1,v2speed after collision
according to the law of conservation of momentum:
p=m1u1+m2u2=m1u1=1000u1
p=m1v1+m2v2=1000∗11+800∗5=15000
1000u1=15000
u1=15sm>13sm
Answer: The van driver has exceeded the speed limit
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