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Masja [62]
2 years ago
5

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Physics
1 answer:
Korvikt [17]2 years ago
4 0

Answer:

Second choice

Explanation:

I suppose ME is the same as POTENTIAL energy

ME = mgh =  70 * 10 * 12 = 8400j

  Half way down,   4200 j is converted to Kinetic Energy

       1/2 m v^2 = 4200

       1/2 (70)  v^2 = 4200       v = 10.95 m/s

  Just before impact ALL of the 8400 j is now KE
      1/2 (70)v^2 = 8400          v = 15.49 m/s

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Explanation:

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6 0
3 years ago
A force of 30 N is required to hold a spring that has been stretched from its natural length of 20 cm to a length of 35 cm. How
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Answer:

0.25 J

Explanation:

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Work done = ?

Considering Hooke's Law of Elasticity.

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4 0
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skelet666 [1.2K]
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Hope this helps!
5 0
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Stells [14]

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Explanation:

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Sine calculator

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3 0
3 years ago
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