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:

you go to your settings preference and in the end youll see sth that says "i want to delete my acc" click on it and u'll acc will be deleted but u have to wait.