Question

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.

Answer 1

Answer:

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:

$\displaystyle K=\frac{1}{2}mv^2$

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:

$\displaystyle K=\frac{1}{2}\cdot 2.1\cdot 35^2$

$\displaystyle K=\frac{1}{2}\cdot2.1\cdot 1225$

K = 1286.25 Joule

The ball has 1286.25 J of energy

Answer 2

Answer:

The ball has kinetic energy

the kinetic energy is 945 J

Explanation: