Answer:
Explanation:
For a car to have a change in mechanical energy, it should be moving on its own. In this case a person is pushing a car, this will not change the mechanical energy of the car.
For a car to gain the kinetic energy, it must acquire a speed. If the car is standing on a hill and you are applying force on from upward direction, it will get attracted due to gravity and thus will acquire a speed which will enhance its kinetic energy.
The energy of the body by the virtue of its motion is kinetic energy. There is no effect on mechanical energy and there will be an increase in the kinetic energy of the system.
The energy of the body by the virtue of its motion is known as the kinetic energy of the body. It is defined as the product of half of mass and square of the velocity.
According to the law of conservation of energy, the total energy is defined as the sum of kinetic energy and potential energy.
Total energy = kinetic energy+potential energy
Also, the energy can not be created nor be destroyed can be transferred from one form to another form.
(A) There is no effect on mechanical energy.
An automobile must be driving on its own in order for mechanical energy to change. In this situation, a person pushing a car has no effect on the mechanical energy of the automobile.
Hence there is no effect on mechanical energy.
(B) There will be an increase in the kinetic energy of the system.
An automobile must travel at a certain speed in order to obtain kinetic energy. If the automobile is standing on a hill and you apply force from above, it will be drawn by gravity and so gain speed, which will increase its kinetic energy.
Hence there will be an increase in the kinetic energy of the system.
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