Question

A body at rest cannot have

• A. Momentum
• B. Kinetic energy
• C. Both A) and B)
• D. Equilibrium

Answer 1

The correct option is C

Both A) and B)

A body at rest.

1. A body at rest is one that does not move with the passage of time. As a result, the body's posture does not alter over time.
2. Many factors are affected by the state of the body when it is at rest and when it is in motion. Because the body does not move when it is at rest, it cannot have velocity.
3. Many notions do not apply to the resting body in this way. The body at rest, according to relativity, is determined by the frame in which it is positioned.

The explanation of the correct Option C:Both A) and B)

A) Momentum: Momentum is the product of mass and velocity, it is also affected by velocity. As a result, a body at rest can't have momentum.

B) Kinetic energy

1. For the particle, there are two forms of energy. Potential energy and kinetic energy are two types of energy.
2. When the body is at rest, its potential energy is at its highest. And because the body's velocity at rest is zero, the kinetic energy remains zero.
3. We know that the body's total energy remains constant. As a result, the body's total energy equals its potential energy. As a result, the body has energy when it is at rest.

The explanation of the wrong answer

Option D:

1. When the vector sum of all forces acting on a single particle equals zero, the particle is said to be in equilibrium. When the vector sum of all torques operating on the item equals zero, a rigid body that differs from a particle due to its expansion characteristics is said to be in equilibrium.
2. When a simple machine experiences no linear nor angular acceleration, it is in equilibrium.
3. Hence, a body at rest can have equilibrium.