For the girl who is lying and her bf

Which car has the most kinetic energy? a. a car of mass 1000 kg with a speed of 3 m/s b. a car of mass 2000 kg with speed 7 m/s c. a car of mass 1000 kg with speed 7 m/s d. a car of mass 2000 kg with speed 3 m/s

If the ama of the inclined plane below is 2, calculate the ima and efficiency. ima = efficiency =

Coal contains energy. a. light b. kinetic c. chemical d. mechanical