What is the correct unit for energy?

What is the equation for calculating gravitational potential energy

What is the equation for calculating kinetic energy?

Calculate the potential energy of a car with a mass of 2,500 kg that is on a hill 100 meters above sea level. (g = 10 Nkg^-1)

Lilly's cat ran through your yard. The cat has a mass of 5 kg. He is running at a speed of 3 m/s. What is the kinetic energy of the cat as he runs? (KE = 1/2mv²)

Alice kicks a soccer ball with a mass of 2.1 kg. The ball leaves the ground moving 30 meters per second. What is the kinetic energy of the soccer ball? (KE = 1/2mv²)

If the 0.3 kg marble was moving at 6 m/s at the bottom of the ramp, how much kinetic energy did the marble have? (KE = 1/2mv²)

If the 1.2 kg basketball rolls at 3 m/s, what is it's kinetic energy? (KE = 1/2mv²)