Question

If a 2 kg ball is traveling at a speed of 4 m/s, what is its kinetic energy?

Answer 1

Answer: 16J

Explanation:

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

K.E = $\frac{1}{2}$ X 2 X 16

K.E = 16

Answer 2

The kinetic energy of the ball is 16 J.

Answer: Option D

Explanation:

Kinetic energy is the form of energy exhibited by a body when it is in motion. The kinetic energy will be directly proportional to the mass of the body as well as to the square of the speed of the body at which it is moving. So the mathematical representation of kinetic energy of any object is

               $\text {Kinetic energy}=\frac{1}{2} \times m \times(v)^{2}$

In the present case, the ball is the object with mass of around 2 kg and it is moving with the speed of about 4 m/s. So, the kinetic energy exhibited by the ball during its motion is

         $\text {Kinetic energy of the ball}=\frac{1}{2} \times 2 \times(4)^{2}=16 \mathrm{J}$

So, the kinetic energy exhibited by the ball is 16 J.