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soldier1979 [14.2K]
3 years ago
5

A boy throws a stone straight upward with an initial speed of 15m/s. What maximum height will the stone reach before falling bac

k down?
Physics
1 answer:
Vitek1552 [10]3 years ago
6 0
height=\frac{velocity^2}{2gravity}\\\\
velocity=15\frac{m}{s}\\\\
g=9,8\frac{m}{s^2}\\\\height=\frac{15^2}{2*9,8}=\frac{225}{19,6}\\\\
\boxed{height=11,48\ meters}
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4.Newton's second law of motion

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Answer:

h = 9.83 cm

Explanation:

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the volume of a sphere

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          V = 4.189 10⁻³ m³

let's calculate the density of the ball

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the tabulated density of water is

         ρ_water = 997 kg / m³

we can see that the density of the body is less than the density of water. Consequently the body floats in the water, therefore the water level that rises corresponds to the submerged part of the body. Let's write the equilibrium equation

            B - W = 0

            B = W

             

where B is the thrust that is given by Archimedes' principle

           ρ_liquid  g V_submerged = m g

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we calculate

            V _submerged = 0.10 9.8 / 997

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Answer:

See the answer below

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