The kinetic energy when it returns to its original height is 100 J
The ball is thrown up with a Kinetic Energy K. E. = 0.5×m×v² = 100 J
Therefore the final height is given by
u² = v² -2·g·s
Where:
u = final velocity = 0
v = initial velocity
s = final height
Therefore v² = 2·g·s = 19.62·s
P.E = Potential Energy = m·g·s
Since v² = 2·g·s
Substituting the value of v² in the kinetic energy formula, we obtain
K. E. = 0.5×m×2·g·s = m·g·s = P.E. = 100 J
When the ball returns to the original height, we have
v² = u² + 2·g·s
Since u = 0 = initial velocity in this case we have
v² = 2·g·s and the Kinetic energy = 0.5·m·v²
Since m and s are the same then 0.5·m·v² = 100 J.
Learn more about kinetic energy at:
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The cyclist must be fed because he needs energy from the food he eats
Answer:
b why is Alice suddenly so thirsty i think
The correct answer is that water, as it rises in the atmosphere, condenses and forms clouds - the correct answer is b.
Other options are false, for example:
a. It evaporates.
-this is the beginning of the process: water needs to evaporate to be in the atmosphere - so it's before the process that the question addresses
Also it is not used up: otherwise Earth would run out of water.
Adding or removing protons from the nucleus changes that atom atomic number so adding and removing protons from the nucleus changes what element that atom is for in example adding an proton to the nucleus of In atom of hydrogon creats an atom of helium
