Question

1. a 0.1 kg tennis ball is moving at 20 m/s. what is its kinetic energy?

o 10 j
o 20 j
o 200 j
o 40 j

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

Given \( m = 0.1\space kg \) and \( v=20\space m/s \). Substitute into the formula: \( KE=\frac{1}{2}\times0.1\times(20)^{2} \).
First, calculate \( (20)^{2}=400 \). Then \( \frac{1}{2}\times0.1\times400 = 0.05\times400 \).

Step3: Calculate the result

\( 0.05\times400 = 20\space J \).

Answer:

20 J