A body of mass 4\text{ kg} moves with a constant velocity of 5\text{ m s}^{-1}. Calculate … — JAMB UTME

A body of mass $4\text{ kg}$ moves with a constant velocity of $5\text{ m s}^{-1}$ . Calculate the kinetic energy of the body in Joules.

Answer: 50 J

The kinetic energy of the body is

50\text{ J}

The kinetic energy of an object in linear motion is calculated using

E_k = \frac{1}{2} m v^2

. Substituting

m = 4\text{ kg}

and

v = 5\text{ m s}^{-1}

gives

E_k = \frac{1}{2} \times 4 \times 5^2 = 50\text{ J}

Identify the given physical quantities

Mass

m = 4\text{ kg}

and velocity

v = 5\text{ m s}^{-1}

Extract values provided in the problem statement.

Apply the formula for kinetic energy

E_k = \frac{1}{2} m v^2

Kinetic energy is defined as half the product of mass and the square of velocity.

Substitute values and solve

E_k = \frac{1}{2} \times 4 \times (5)^2 = 50\text{ J}

Perform arithmetic evaluation to get the final energy in Joules.

Kinetic Energy

Question