Question

What is the mass of a baseball that has a kinetic energy of 100 J and travel at 5 m/s

Answer 1

K.E= 1/2 mv²
So, m= K..E*2/v²
∴ m= 100 *2/ 25
m=8 Js²/m
As, the unit of K.E and velocities are in SI so unit of mass would also be in SI i.e, kg
So, m=8 kg

Answer 2

mass = kinetic energy * 2 / velocity^2

=> mass= 100 * 2 / 5^2

= 200 / 25 = 8 kg

in short , your answer is 8 kg