17.86m/s
Explanation:
Given parameters:
Displacement of the ball = 50m
Time taken = 2.8s
Unknown:
Velocity of the ball = ?
Solution:
velocity is the rate of change of displacement with time
Velocity = ![\frac{displacement}{time}](https://tex.z-dn.net/?f=%5Cfrac%7Bdisplacement%7D%7Btime%7D)
Velocity =
= 17.86m/s
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velocity brainly.com/question/5248528
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Answer:
The maximum height is 10.0m
Both balls hit the ground at the same time.
We've known this fact for about 500 years (since Galileo),
and we've known WHY for about 300 years (since Newton).
The relative pressure at the bottom of the lake is given by
![p_r = \rho g h](https://tex.z-dn.net/?f=p_r%20%3D%20%5Crho%20g%20h)
where
![\rho](https://tex.z-dn.net/?f=%5Crho)
is the water density
g is the gravitational acceleration
h is the depth at which the pressure is measured
At the bottom of the lake, h=27.8 m, so the relative pressure is
![p_r = (1\cdot 10^3 kg/m^3)(9.81 m/s^2)(27.8 m)=2.72 \cdot 10^5 Pa](https://tex.z-dn.net/?f=p_r%20%3D%20%281%5Ccdot%2010%5E3%20kg%2Fm%5E3%29%289.81%20m%2Fs%5E2%29%2827.8%20m%29%3D2.72%20%5Ccdot%2010%5E5%20Pa)
To find the absolute pressure, we must add the atmospheric pressure,
![p_a](https://tex.z-dn.net/?f=p_a)
, to this value: