Question

what is the kinetic energy when mass = 4kg and velocity = 3m/s? 12 j 18 j 24 j 36 j

Explanation:

Step1: Recall the kinetic energy formula

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

Step2: Substitute the given values

Given \(m = 4\space kg\) and \(v=3\space m/s\), substitute into the formula: \(KE=\frac{1}{2}\times4\times3^{2}\).
First, calculate \(3^{2}=9\). Then \(\frac{1}{2}\times4 = 2\).

Step3: Calculate the final result

Multiply \(2\times9=18\).

Answer:

B. \(18\space J\)