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1. A 1000.0 kg car is moving at 20 km/h. If a 2000.0 kg truck has...

1. A 1000.0 kg car is moving at 20 km/h. If a 2000.0 kg truck has 25 times the kinetic energy of the car, how fast is the truck moving? 2. A car of mass 1005 kg collides head-on with a parked truck of mass 2010 kg. Spring mounted bumpers ensure that the collision is essentially elastic. If the velocity of the truck is 15 km/h (in the same direction as the car's initial velocity) after the collision, what was the initial speed of the car?

2. A car of mass 1005 kg collides head-on with a parked truck of mass 2010 kg. Spring mounted bumpers ensure that the collision is essentially elastic. If the velocity of the truck is 15 km/h (in the same direction as the car's initial velocity) after the collision, what was the initial speed of the car?

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Answer #1

Use the equation for kinetic energy to find the speed of truck and use momentum conservation principle and properties of elastic collision to find the required initial speed of the car as shown below

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