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Dima020 [189]
3 years ago
9

A meteor is approaching earth, what's its motion?

Physics
1 answer:
Sedbober [7]3 years ago
3 0
Constant acceleration
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A car of mass 500 kg is moving at a speed of 1.2 m/s. A man pushes the car, increasing the speed to 2 m/s. How much work did the
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Option B - 360 J

Explanation:

One of the formulas used to find out how much work was done is :

E = 0.5×m×v² (where m is the mass and v is the velocity)

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E = 0.5×500×1.2²

E = 250×1.2²

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E = 360 J

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A pendulum has 711 J of potential energy at the highest point of its swing. How much kinetic energy will it have at the bottom o
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According to law of conservation of energy, 
<span>Energy can neither be constructed nor be destroyed but can be transformed from one form to another.
</span>
<span>At the highest point of the pendulum(point b), pendulum is associated with potential energy only and no kinetic energy.
</span><span>Therefore total energy at point b = potential energy = 711 J.... i
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<span>At the bottom most point(point a), pendulum is associated only with kinetic energy and no potential energy.
</span>Therefore total energy at point a = kinetic energy ---- ii
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Hence kinetic energy at the bottom most point is 711 J.
Hope this helps!!

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3 years ago
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