If an object has 60 joules of kinetic energy and a total of 288 J of mechanical energy, how many joules of potential energy does the object have?

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?

This is for my 8th grade science class, i really don’t understand. can someone me? , lol.

What causes the formation of ocean currents?