Question

A particle is moving freely. Then its; 1) Kinetic energy is always greater than zero; 2) Potential energy is greater than zero and kinetic energy is less than zero; 3) Potential energy is less than zero and kinetic energy is greater than zero; 4) Potential energy is zero and kinetic energy is less than zero

Answer 1

1) Kinetic energy is always greater than zero

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A particle is moving freely. Then its Kinetic energy is always greater than zero

Answer 2

A particle is moving freely. Then the Kinetic energy is always greater than zero.

• Kinetic energy is the energy present due to the motion of the object.
• Kinetic energy = 1/2 X m X v²

        Here, m = mass of the object and v = the velocity of the object.

• Since the mass of an object and the square of the velocity are always positive, a moving object can never have kinetic energy less than zero.
• For a body at rest, v² = 0. Hence KE = 0J