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Snowcat [4.5K]
3 years ago
7

The calculation of kinetic energy uses the formula, KE = 1 2 mv2. Identify the unit that is required for mass and velocity, resp

ectively, to determine the kinetic energy in Joules. A) mass in g, velocity in m s B) mass in kg, velocity in m s C) mass in g, velocity in km hr D) mass in kg, velocity in km hr
Physics
2 answers:
shusha [124]3 years ago
8 0

So the answer  is B.  because the mass have  Kg as a international unit and velocity is m/s, they are  international units in physics.

kompoz [17]3 years ago
4 0

Answer:

Mass : kg

Velocity : m/s

Explanation:

Kinetic energy is due to the motion of an object. The mathematical expression for the kinetic energy is given by :

E_k=\dfrac{1}{2}mv^2

Where

m is the mass of the object

v is the velocity of object  

The SI unit of kinetic energy is joule (J). One joule equals :

E_k=\dfrac{1}{2}\times kg\times m/s=Joule

Every physical quantity must be in SI units So, mass must be in kilogram (kg) and velocity must be in meter/second (m/s).

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a stone is vertically thrown upward with the velocity of 72km/hr find the maximum height reached the height​
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If a snowboarder’s initial speed is 4 m/s and comes to rest when making it to the upper level. With a slightly greater initial s
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(a) At a corresponding hill on Earth and a lesser gravity on planet Epslion, the height of the hill will cause a reduction in the initial speed of the snowboarder from 4 m/s to a value greater than zero (0).

(b) If the initial speed at the bottom of the hill is 5 m/s, the final speed at the top of the hill be greater than 3 m/s.

<h3>Conservation of mechanical energy</h3>

The effect of height  and gravity on speed on the given planet Epislon is determined by applying the principle of conservation of mechanical energy as shown below;

ΔK.E = ΔP.E

¹/₂m(v²- u²) = mg(hi - hf)

¹/₂(v²- u²) = g(0 - hf)

v² - u² = -2ghf

v² = u² - 2ghf

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  • hf is final height
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when u² = 2gh, then v² = 0,

when gravity reduces, u² > 2gh, and v² > 0

Thus, at a corresponding hill on Earth and a lesser gravity on planet Epslion, the height of the hill will cause a reduction in the initial speed of the snowboarder from 4 m/s to a value greater than zero (0).

<h3>Final speed</h3>

v² = u² - 2ghf

where;

  • u is the initial speed = 5 m/s
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  • v is final speed
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Since g on Epislon is less than 9.8 m/s² of Earth;

5² - 2ghf > 3 m/s

Thus, if the initial speed at the bottom of the hill is 5 m/s, the final speed at the top of the hill be greater than 3 m/s.

Learn more about conservation of mechanical energy here: brainly.com/question/6852965

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