I will give YOU brainliest if you answer something I like!\ How can something follow the law of conservation of energy?

The law of conservation of energy says that the total energy of a closed system will remain constant (so its conserved over time). This law is also where you get energy can't be created or destroyed, only converted. One example is a bowling ball hitting pins. Since the bowling ball has kinetic energy (it's moving), hitting the pins will transfer the ball's energy over to the pins. This makes the bowling pins fall over.

at positions a, g kinetic energy is maximum.

at position d, potential energy is maximum.