How to find the time in the air based off of the height and velocity
Answers
Answer:
To find time to reach maximum height given initial velocity use the equation Vf=vi+at. At the maximum height, the object has no initial velocity left and therefore you can substitute 0 for the Vf in the equation.
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I tried 3(-9.8m/s2) and some other formula's but could never arrive at the correct answer of 24.7m/s. Could someone explain how to arrive at this answer and the reasoning behind it?
Answers
-- You kick it horizontally, out off of the cliff, at 15 m/s. There's no horizontal
force on it, so its horizontal speed never changes.
-- As soon as it clears the edge of the cliff, gravity starts accelerating it
downward, 9.8 m/s faster every second. After 2 seconds, it has
(2 x 9.8) = 19.6 m/s
of downward vertical speed.
At this point, its velocity points somewhere between horizontal and downward-
vertical. I gather from the wording of the question that you're not so much
concerned with the direction of the velocity as you are with its magnitude ...
that is, the stone's speed in whatever direction it's actually moving.
You have a vector with two components: 15 horizontal and 19.6 vertical.
Those components are perpendicular, so their resultant is just the hypotenuse
of the right triangle.
(Speed)² = (15 m/s)² + (19.6 m/s)²
= (225 m²/s²) + (384.16 m²/s²)
= (609.16 m²/s²) .
Speed = √(609.16 m²/s²) = 24.681 m/s
That's where the 24.7 m/s comes from. /\
(I just looked back at the question again. Notice that we don't care
how high the cliff is. That "44m" is in there only to distract those who
don't know what they're doing, and who think that they must use it
just because it's there.)
the y velocity is 19.62 after 2 seconds because of acceleration of 9.81 m/s x 2
the velocity can be found by making a diagram and solving through the pythagorean theorem
15 sq + 19.62 sq = velocity sq
225 + 384.9444 = velocity sq
velocity = sqrt 609.944
velocity = 24.7
Answers
even WITHOUT seeing the choices.
Time = (displacement) / (magnitude of average velocity) .
As the distance increases by a factor, the electric force increases by twice that factor.
As the distance increases by a factor, the electric force decreases by twice that factor.
As the distance increases by a factor, the electric force decreases by the same factor.
As the distance increases by a factor, the electric force decreases by the square of that factor.
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F = 1/d^2
So,
As the distance increases by a factor, the electric force decreases by the square of that factor.
B 100 meters/second
C 1 meter/second
D 10 meters/second
Other ___________
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Answer:
The answer to your question is the letter D) 10 m/s
Explanation:
Data
distance = 100 m
time = 10 s
velocity = ?
Definition. Velocity is the rate of change of distance with respect to time.
Formula
Velocity = distance / time
-Substitution
Velocity = 100 / 10
-Simplification
Velocity = 10 meters/second
Answers