Imagine a 15 kg block moving with a velocity of 20 m/s to the left. calculate the kinetic energy of this block.
show the equation, your work, and the answer with units:

The Kinetic energy of this block will be "3000 J".

According to the question,

Mass,

Velocity,

As we know the formula,

→

By substituting the given values, we get

→                                    

→                                    

→                                    

→                                    

Thus the above answer is correct.

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3000 J

Explanation:

Kinetic energy is:

KE = ½ mv²

If m = 15 kg and v = -20 m/s:

KE = ½ (15 kg) (-20 m/s)²

KE = 3000 J

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me