Question

3.1 types of energy an object has a speed of 10 m/s and a kinetic energy of 5 j. what is the mass of the object? ○ 5 g ○ 10 g ○ 100 g ○ 50 g

Explanation:

Step1: Recall kinetic energy formula

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

Step2: Rearrange formula for mass

From $KE = \frac{1}{2}mv^2$, multiply both sides by 2: $2KE = mv^2$. Then divide both sides by $v^2$: $m=\frac{2KE}{v^2}$.

Step3: Substitute values

Given $KE = 5\ J$ and $v = 10\ m/s$. Substitute into the formula: $m=\frac{2\times5}{10^2}=\frac{10}{100}=0.1\ kg$.

Step4: Convert kg to g

Since $1\ kg = 1000\ g$, $0.1\ kg = 0.1\times1000 = 100\ g$.

Answer:

100 g (corresponding to the option "100 g")