Question

The calculation of kinetic energy uses the formula, KE = 1 2 mv2. Identify the unit that is required for mass and velocity, respectively, to determine the kinetic energy in Joules. A) mass in g, velocity in m s B) mass in kg, velocity in m s C) mass in g, velocity in km hr D) mass in kg, velocity in km hr

Answer 1

So the answer  is B.  because the mass have  Kg as a international unit and velocity is m/s, they are  international units in physics.

Answer 2

Answer:

Mass : kg

Velocity : m/s

Explanation:

Kinetic energy is due to the motion of an object. The mathematical expression for the kinetic energy is given by :

$E_k=\dfrac{1}{2}mv^2$

Where

m is the mass of the object

v is the velocity of object  

The SI unit of kinetic energy is joule (J). One joule equals :

$E_k=\dfrac{1}{2}\times kg\times m/s=Joule$

Every physical quantity must be in SI units So, mass must be in kilogram (kg) and velocity must be in meter/second (m/s).