Final answer:
The mass of the moving object is 40 kg.
Step-by-step explanation:
Kinetic energy depends on the mass and velocity of an object. The formula to calculate kinetic energy is KE = (1/2) * mass * velocity^2. In this case, the kinetic energy is given as 500 J and the speed is given as 5 m/s. Plugging these values into the formula, we can solve for the mass:
500 = (1/2) * mass * 5^2
500 = (1/2) * mass * 25
mass = 500 / (1/2 * 25) = 500 / (12.5) = 40 kg
Therefore, the mass of the object is 40 kg. None of the given options (a) 25 kg, (b) 50 kg, (c) 100 kg, (d) 125 kg are correct.