An object moving with a speed of 21m/s and has a kinetic energy of 140 J.what is the mass of the object.

The formula for kinetic energy is: Where:- is the kinetic energy,- is the mass of the object,- is the velocity (speed).Rearranging the formula to solve for : Substitute the given values ( , ): First, calculate : Now substitute back: Simplify: Thus, the mass of the object is approximately **0.635 kg**.