Physics, 23.12.2019 16:31 awesome266

Aball is thrown vertically upward with a speed of 25.1 m/s. how high does it rise? the acceleration due to gravity is 9.8 m/s2 . answer in units of m.
how long does it take to reach its highest point? answer in units of s.
how long does it take the ball to hit the ground after it reaches its highest point? answer in units of s.
what is its velocity when it returns to the level from which it started? answer in units of m/s.

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Things you should know before answering... At its absolute highest point the velocity of a ball will be 0 m/s.
1. You have Vi,Vf, and a. You're looking for d so the best equation is: vf^2=Vi^2+2ad (0=26.5^2+2(-9.81)d).
0=702.5-19.62d
-702.5=-19.62d
d=35.793 meters

2. You now have Vi,Vf,a, and d. You are looking for t. There are many equations you can use but to keep things simple we will use: Vf=Vi+at (0=26.5-9.81t)
-26.5=-9.81t
t=2.701 seconds

3. You just have to double the time it took to reach the top.

4. Depends on what the question means. Theoretically at the starting point if the ball is no longer travelling it's at 0. If not then you should know that the descent on something falling vertically is mirrored exactly to the ascent meaning that the final speed is 26.5 m/s.

Vf^2=Vi^2+2ad
Vf^2=0+2(-9.81)35.793
vf=sqrt(702.259)
vf=26.5001

Answer from: Quest

I’m good with pshycology

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electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia

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Aball is thrown vertically upward with a speed of 25.1 m/s. how high does it rise? the acceleration...