An object has velocity of 8 m/s and kinetic energy of 480j what is the mass of the object

Work Shown:

KE = 480

v = 8

KE = (1/2)*m*v^2

480 = 0.5*m*8^2

480 = 0.5*m*64

480 = 0.5*64m

480 = 32m

32m = 480

m = 480/32

m = 15

The SI unit for mass is in kilograms

Also a joule is defined with kilograms since 1 J = 1 kg*m/s^2

1 joule is the amount of energy needed to move an object of mass 1 kg with an acceleration of 1 m/s^2

So this is why the mass m is in kilograms.