1. You serve a volleyball with a mass of 2.1 kg. The ball leaves your hand with a speed of 30 m/s. Siven: Find: Solution: Formula:
Answer:
The formula for energy is: KE = 0.5 * m * v^2 (where, KE = Kinetic Energy, m = mass, v = velocity)
So, KE = 0.5 * 2.1 kg * (30 m/s)^2
Or, KE = (0.5 * 2.1 kg) * (900 m^2/s^2) = 4050.0 J
Therefore, the amount of kinetic energy that the volleyball has as it leaves your hand is 4050.0 J. This energy will be transferred into different forms, one of them being sound energy, as the volleyball travels through the air and eventually comes into contact with other objects.