Answer : The mass of the soccer ball is, 0.4 Kg
Explanation : Given,
Kinetic energy of the ball = 500 J
Velocity of the ball = 50 m/s
Formula used :
where,
K.E = kinetic energy of the ball
m = mass of the soccer ball
v = velocity of the ball
Now put all the given values in this formula, we get mass of the soccer ball.

Therefore, the mass of the soccer ball is, 0.4 Kg