If the height is 10m, what is the potential energy? Asuming that the mass is 10

What is the acceleration of a spaceship that is initially at rest and then speeds up to 220 m/s in 20 seconds

If a refrigerator is a heat pump that follows the first law of thermodynamics, how much heat was removed from food inside of the refrigerator if it released 380j of energy to the room?

If two students are running down the hall toward each other, trying to get to class, and they have the same mass and acceleration, what will happen when they collide? will their forces cancel out or will each one experience a reaction?