Question

An object at rest may have
A) Momentum B) Potential energy C) Velocity D) Kinetic energy

Answer 1

An object at rest may have potential energy. hence option (B) is correct.

An object at rest may have..

      A) momentum                              B) potential energy

     C) velocity                                     D) kinetic energy

First we should understand the all the terms available in options.

• momentum : It is the product of mass and velocity. the momentum of   an object shows that the object is in motion because it has velocity. so it can't be correct option.

• Potential energy : It is the amount of energy stored by an object due to its position. it is the product of mass , acceleration due to gravity and position of object from the reference level. i.e., U = mgh. here, it is clear that it is independent of state of motion. so an object at rest may have potential energy.

• velocity : displacement covered by an object per unit time is known as velocity. hence, it is not the correct option, is it ?

• kinetic energy : It is the amount of energy of an object due to its motion. that is kinetic energy is the half of product of mass and square of speed of the object ( K.E = 1/2 mv²). hence, it is also not the correct option.

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