Question

when an object is thrown vertically upwards it velocity goes on decreasing what happenes to it potential energy as its velocity become zero​

Answer 1

Hello there!

When an object is released from the hand, and is not touching any other object, its Total Energy will remain constant within itself.

The types of energy related with motion are Kinetic Energy and Potential Energy. Potential Energy is the amount of energy when the object is not moving, and Kinetic Energy is the amount of energy when the object is moving.

When you throw the ball, and the ball leaves your hand: from that point onwards, the Total Energy will not be able to change. Energy is only converted between different forms.

So, as soon as the ball reaches the highest point, its Kinetic Energy will be zero at that moment, because it stops moving (velocity = 0). Remember we said that Total Energy cannot be changed (until it hits something)? So, if KE is zero, and Total Energy is constant, then it means that all the energy is converted to Potential Energy. That is your answer. See, it is very simple!

Important points/concepts to remember:

1. An object's total energy will be constant until it hits something.
2. The types of energies related to Motion are: Potential Energy and Kinetic Energy.
3. Potential Energy + Kinetic Energy = Total Energy
4. If one is zero, then the other will be equal to the total energy.