A1000.0 kg car is moving at 15 km/h. if a 2000.0 kg truck has 18 times the kinetic energy of the car, how fast is the truck moving?

45 km/h

Explanation:

The kinetic energy of the car is given by:

where

m=1000.0 kg is the mass of the car

v=15 km/h is its speed

The kinetic energy of the truck is given by:

where

M = 2000.0 kg is the mass of the truck

V is its unknown speed

We know that the truck has 18 times the kinetic energy of the car, therefore:

Substituting and re-arranging, we can find V:

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explanation: