Question

A girl at rest at gate of her society which is 3.2 m above the road comes down the slope AB on a cycle without paddling. [g = 10 N/kg] 7. (i) The mechanical energy possessed by the girl at B is 1. Vibrational kinetic energy. 2. Translational kinetic energy 3. Elastic potential energy. 4. Gravitational potential energy​

Answer 1

Answer:

Gravitational Potential Energy

Explanation:

Cuz the force is of gravity and she isnt using her force to pedal

Answer 2

The mechanical energy possessed by the girl at B is Gravitational Potential Energy​ (option 2).

• Gravitational Potential Energy is potential energy possessed by a body due to its position/configuration with respect to a gravitational field.
• In this case, when the girl is at B and has not yet started her descent, she is in Earth's gravitational field and possesses potential energy.
• Gravitational Potential Energy is formulated as:

                             U = $\frac{-GMm}{R}$

where G is the Gravitational Constant

           M is the mass of the larger body

           m is the mass of the smaller body

            R is the distance between both bodies

• However, in case the body is close to the Earth, the expression for potential energy is simplified to:

                                U = mgh

where m is the mass of the body

           g is the acceleration due to gravity

   and h is the height above the Earth.

• This Gravitational Potential Energy will get converted to Translational Kinetic Energy when the girl descends the slope, as per the Principle of Conservation of Mechanical Energy.

Hence, the girl possesses option 4. The Gravitational potential energy​ at B.