You serve a volleyball with a mass of 2.1 kg. The ball leaves your hand with a speed of 35 m/s. The ball has energy. Calculate it.

The ball has 1286.25 J of energy

Explanation:

Kinetic Energy

Is the type of energy of an object due to its state of motion. It's proportional to the square of the speed.

The equation for the kinetic energy is:

Where:

m = mass of the object

v = speed at which the object moves

The kinetic energy is often expressed in Joules (J).

The volleyball of a mass m=2.1 Kg is served at v=35 m/s, calculating its kinetic energy:

K = 1286.25 Joule

The ball has 1286.25 J of energy

less than one you can't create energy

one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.