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3 years ago

Help please

Physics

1 answer:

Anarel [89]3 years ago

4 0

Answer:

1) D, 2) D, 3) B, 4) B, 5) C

Explanation:

You are asked to select the correct answer

1) The conservation of energy is one of the most important principles of physics that allows solving countless problems in life.

the correct answer is D

2) when a body falls, the gravitational potential energy is transformed into kinetic energy and both are transformed into thermal energy

the correct answer is D

3) When the gravitational potential energy is maximum, the kinetic energy is minimum and when the kinetic energy is maximum, the gravitational energy is minimum.

Correct answer B

4) speed is defined by

v = x / t

so the correct answer is B in the SI system

5) when we repeat a measurement several times, the random or statistical errors decrease, therefore the confidence of the measurement increases.

The correct answer is C

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<h2>Hello!</h2>

The answer is:

The kinetic energy of the object is equal to 85 J.

The kinetic energy involves the speed and the mass of an object in motion. We can calculate the following the work needed to speed an object (kinetic energy) using the equation:

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

Where,

m, is the mas of the object

v, is the speed of the object.

Now, we are given:

$mass=m=6.8kg\\speed=v=5\frac{m}{s}$

So, substituting and calculating the kinetic energy of the object, we have:

$KineticEnergy=\frac{1}{2}*6.8kg*(5\frac{m}{s})^{2}$

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$KineticEnergy=\frac{1}{2}*170kg\frac{m^{2}}{s^{2}}$

$KineticEnergy=85kg\frac{m^{2}}{s^{2}}=85J$

We have that the kinetic energy of the object is equal to 85 J.

Have a nice day!

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