A javelin is thrown at 28.5 m/s from flat
2 answers:
The time for the javelin in the air will be 3.977 second
<h3>What is the period?</h3>The value of time needed to complete the upward and the downward motion is the total period. Its unit is the second and is denoted by t. T is the time at which the ball first hits the ground.
Given data;
Θ is the angle of throw = 43.2°
u is the thrown velocity = 28.5 m/s
t is the time for the javelin in the air
The time period is found as;
Hence the time for the javelin in the air will be 3.977 second
To learn more about the period, refer to the link;
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The object's <u>initial velocity</u> is equal to
Why?
From the statement we know the height of the tree and the time it takes to reach the ground, so, if we need to calculate its initial velocity, we can use the following formula:
Where,
y, is the final height (0 meters in this case)
yo, is the initial height (111 meters in this case)
t, is the time elapsed (3.8 seconds in this case)
vo, is the initial speed.
g, is the acceleration due to gravity (-9.81 m/s2)
Now, let's set the origin at the top of the tree, so, rewriting the formula, we have:
So, isolating the initial velocity, we have:
Finally, substituting and calculating, we have:
Hence, we have that the <u>initial velocity</u> of the object is
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