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mars1129 [50]
2 years ago
9

FAST PLEASE What is the change in internal energy if 90 J of thermal energy is added to a

Physics
1 answer:
vladimir1956 [14]2 years ago
5 0
A is right because I took the test
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An object is projected from the ground with an upward speed of ų m/s has a speed of 23m/s when it is at a height of 5m above the
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Answer:

25.08m/s

Explanation:

mgh1 + 0.5mv1² = mgh2 + 0.5mv2²

h1 = 0m

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putting the values into the formula above;

m(10)(0) + 0.5m(u²) = m(10)(5) + 0.5m(23²)

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0.5mu² = 314.5m

dividing through by m

0.5u² = 314.5

u² = 629

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<u>Theref</u><u>ore</u><u>,</u><u> </u><u>the</u><u> </u><u>init</u><u>ial</u><u> </u><u>speed</u><u> </u><u>"</u><u>u</u><u>"</u><u> </u><u>=</u><u> </u><u>2</u><u>5</u><u>m</u><u>/</u><u>s</u>

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True

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Friction
Hope it helped
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