Question

Kinetic energy of a moving object is 500 J. If it is moving at a speed of 5 m/s, what is its mass?

a) 25 kg
b) 50 kg
c) 100 kg
d) 125 kg

Answer 1

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.