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

answer: 802.3 kilo joules of energy represents 191.75 kilo calorie of energy.

explanation:

energy released during combustion of one mole methane = 802.3 kilo joules

if 1 kilo joule = 0.239006   kilo calorie

then ,802.3 kilo joule will be = 802.30.239006 kilo calorie

802.3 kilo joule = 191.75 kilo calorie

hence, the energy in kilo calorie is 191.75 kilo calorie.