Question

1. you serve a volleyball with a mass of 2.1 kg at a speed of 30 m/s. how much kinetic energy does the ball have?

Explanation:

Step1: Recall the kinetic energy formula

The formula for kinetic energy is \( KE=\frac{1}{2}mv^{2} \), where \( m \) is the mass and \( v \) is the velocity.

Step2: Substitute the given values into the formula

Given \( m = 2.1\space kg \) and \( v=30\space m/s \). Then \( KE=\frac{1}{2}\times2.1\times30^{2} \).
First calculate \( 30^{2}=900 \). Then \( \frac{1}{2}\times2.1\times900=( \frac{1}{2}\times900)\times2.1 = 450\times2.1\).

Step3: Calculate the final result

\( 450\times2.1 = 945\space J \)

Answer:

The kinetic energy of the ball is \( 945\space J \)