Question

A ball is thrown vertically upwards in free space. Its total mechanical energy​

Answer 1

The complete question is:

A ball is thrown vertically upwards in free space. Its total mechanical energy​:

1. Increases
2. Decreases
3. Remains constant
4. None

The mechanical energy of the ball remains constant.

• We know that total mechanical energy is the sum of the kinetic energy of the body and its potential energy.
• The kinetic energy of the ball= 1/2 mv², where m is the mass of the ball and v is its velocity.
• The kinetic energy of the ball = m*g*h, where m is the mass of the ball, g is the acceleration due to gravity and h is the height attained by the ball.
• As the ball rises up, the kinetic decreases and converts in its potential energy, therefore the total energy remains constant.