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tatyana61 [14]
3 years ago
9

Between two objects.

Physics
1 answer:
Ira Lisetskai [31]3 years ago
6 0

Answer:

C Friction

Explanation:

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Answer:

a) U_{g} = 40\,J, b) \eta = 70\,\%, c) v = 20\,\frac{m}{s}

Explanation:

a) The initial potential energy is:

U_{g} = (0.2\,kg)\cdot \left(10\,\frac{m}{s^{2}} \right)\cdot (20\,m)

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b) The efficiency of the bounce is:

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c) The final speed of Danielle right before reaching the bottom of the hill is determined from the Principle of Energy Conservation:

K = U_{g}

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v = \sqrt{\frac{2\cdot U_{g}}{m} }

v = \sqrt{\frac{2\cdot (40\,J)}{0.2\,kg} }

v = 20\,\frac{m}{s}

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3 years ago
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