Question

You serve a volleyball with a mass of 2.1kg. The ball leaves your hand at 30m/s.

The ball has __________________ energy. Calculate it.

Answer 1

Step-by-step explanation:

Given parameters:

Mass of volleyball = 2.1kg

Velocity = 30m/s

Unknown:

The nature of the energy possessed by the ball =?

Amount of this energy = ?

Solution:

As the ball is being served and it acquires velocity, it will have a kinetic energy.

Kinetic energy is the energy due to the motion of body. It is mathematically expressed as:

K.E =
`(1)/(2)` m v ²

m is the mass of the body

v is the velocity

Insert the given parameters and solve;

K.E =
`(1)/(2)` x 2.1 x 30²

K.E = 945J