Question

Imagine a 15kg block moving with a speed of 20m/s. Calculate the kinetic energy of this block. (Show the equation, show your work and answer with units.)

Answer 1

Answer:

3000 Joules

Explanation:

Hello, I can help you with this.

the kinetic energy  of an object is the energy that it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity.it is given by:

$E_{k}=\frac{1}{2}mv^{2}$

Step 1

all you have to do is to put the values into the equation

Let

m= 15 kg

speed=20 m/s

$E_{k}=\frac{1}{2}mv^{2}\\E_{k}=\frac{1}{2}(15kg)(20\frac{m}{s}) ^{2}\\E_{k}=\frac{1}{2}(15kg)(400)\frac{m^{2} }{s^{2} } \\E_{k}=3000 kg \frac{m^{2} }{s^{2} }$

by definition

$1Kg\frac{m^{2} }{s^{2} }=1 Joule$

so, the kinetic energy of the block is 3000 Joules

I hope it helps, Have a great day.

Answer 2

Answer:

The answer to your question is:        Ke = 3000 Joules

Explanation:

Data

mass = 15 kg

speed = 20 m/s

Kinetic energy = ?

Equation

               $Ke = \frac{1}{2}mv^{2}$

               $Ke = \frac{1}{2}(15)(20)^{2}$

                Ke = 3000 Joules