Question

A 2-kg bowling ball is 1 meter off the ground on a post when it falls. Just before it reaches the ground, it is traveling 4.4 m/s. Assuming that there is no air resistance, which statement is true?

The mechanical energy is not conserved.

The mechanical energy is conserved.

The intial potential energy is greater than the final kinetic energy.

The initial potential energy is less than the final kinetic energy.

Answer 1

The mechanical energy is conserved.

Answer 2

Answer:The correct answer is 'The mechanical energy is conserved'.

Step-by-step explanation:

Mechanical energy of the body is defined a sum of potential energy and kinetic energy possessed by the body in motion. It is the energy associated with position and motion of the body.

Mechanical energy = Potential energy + Kinetic Energy

The principle of Conservation of Mechanical Energy states that the mechanical energy of the body remains constant as long as the forces acting on the body are conservative forces.

From, this we can say that mechanical energy of the bowling ball with mass of 2 kg falling at speed of 4.4 m/s will remain conserved.