An object has a total mechanical energy of 150 J. At point A, the object has a kinetic energy
of 30 J and has a potential energy of 120 J. At point B, what is the kinetic energy of the object if
its potential energy is 90 J?

60 J

Explanation:

The law of conservation of energy states that energy is neither created nor destroyed, just converted into different forms. This means the total mechanical energy of the object at point A will be the same as the total mechanical energy at point B, and the question tells us the total of that mechanical energy is 150 J. Note we are assuming no energy is lost from the system as heat.

At point B, if the potential energy is 90 J, the remainder of the 150 J total must be kinetic energy. KE = 150 J - 90 J = 60 J.

it forms an anion that has a larger radius. anions have a negative charge and are larger than the original atom.

there are two significant figures.