Final answer:
The speed of the moving body is 2 m/s.
Step-by-step explanation:
To calculate the speed of a moving body, we can use the equation:
Kinetic energy = 0.5 * mass * speed2
Given that the mass of the body is 10 kg and the kinetic energy is 20 J, we can rearrange the equation to solve for speed:
20 J = 0.5 * 10 kg * speed2
Simplifying:
20 J = 5 kg * speed2
Dividing both sides by 5 kg:
4 m/s2 = speed2
Taking the square root of both sides:
speed = 2 m/s
Therefore, the speed of the moving body is 2 m/s.