Question

15) Food Fight! Someone throws a perfectly good hamburgeracross the cafeteria. What velocity does it experience if ithas a mass of 0.35 kg and has 79 Joules of kineticenergy?

Answer 1

Given:

Mass, m = 0.35 kg

Kinetic energy, K.E = 79 J

Let's find the velocity.

To solve for the velocity, apply the formula below:

`K.E=(1)/(2)mv^2`

Where m is the mass, v is the velocity and K.E is the kinetic energy in Joules.

Rewrite the formula for v:

`v=\sqrt[]{\frac{2(K\mathrm{}E)}{m}}`

Input values into the equation:

Thus, we have:

`\begin{gathered} v=\sqrt[]{(2(79))/(0.35)} \\ \\ v=\sqrt[]{(158)/(0.35)} \\ \\ v=\sqrt[]{415.429} \\ \\ v=21.25\text{ m/s} \end{gathered}`

Therefore, the velocity is 21.25 meters per second(m/s).

ANSWER:

21.25 m/s