Answer: 10 m/s
Explanation:
The formula for kinetic energy is:
K = (1/2)mv², where:
- K is the kinetic energy of the object (J)
- m is the mass of the object (kg)
- v is the velocity of the object (m/s)
We are given:
- K = 20 J
- m = 400g = 0.4 kg
Let's substitute these values into the formula:
20 = (1/2)(0.4)v²
Solve for v:
40 = 0.4v²
100 = v²
v = √100
v = 10 m/s
The velocity of the ball is 10 m/s.
