Question

The kinetic energy of a body of mass m moving with velocity v is 1/2mv2

Answer 1

The kinetic energy of a body with mass m moving at a velocity v is one half the product of the mass of the body and the square of its velocity, i.e., KE = 1⁄2 mv 2. Even when a body appears to be at rest, its atoms and molecules are in constant motion and thus have kinetic energy.

Answer 2

The kinetic energy of a body of mass m is the energy possessed by the moving object on account of its motion.

Explanation

KINETIC ENERGY -

• The energy possessed by an object by virtue of its motion.
• It depends on the mass and motion of the moving object.
• When a force is applied to a body, it moves and speeds up, resulting in an increase in kinetic energy.
• The energy can be transferred between objects and transformed into other energy forms.
• The energy can be due to different types of motions - translation, rotational, vibrational, or combinations of the motions.
• In translational motion, kinetic energy is the product of half the mass and velocity of the moving object.
• The kinetic equation is -

                   $K.E. = \frac{1}{2}mv^2$

• The standard unit of kinetic energy is $kgms^2$or joule.