- #1
mtsac
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I understand many of you may take me for a fool since this is a practically elementary physics problem but I really need some help finding out the right formulas or formula to solve it. No answers though, I actually want to learn this stuff.
Problem:
You shoot an arrow into the air. After 1.2 seconds the arrow has gone straight upward to a height of 32.0 m above its launch point. Ignore air resistance.
(a) What was the arrow's initial speed?
(b) How long did it take for the arrow to first reach a height of 16 m above its launch point?
So far, the variables I have are as following:
Δx= 32m
Δt= 1.2s
(pretty obvious)
I calculated the average velocity to be 26.66m/s using the formula v=Δx/Δt. Thus,making the final velocity 53.33m/s? Yes/no? For acceleration, I got 5.53m/s^2, but it just doesn't add up.
Above all else, I find the initial speed question particularly confusing. Can one not assume that the arrow began with an initial speed of 0m/s since it was in a resting state? Or is one supposed to assume the initial speed is the speed the arrow reaches almost instantaneously after it is launched?
I'd greatly appreciate any help.
Thank you
Problem:
You shoot an arrow into the air. After 1.2 seconds the arrow has gone straight upward to a height of 32.0 m above its launch point. Ignore air resistance.
(a) What was the arrow's initial speed?
(b) How long did it take for the arrow to first reach a height of 16 m above its launch point?
So far, the variables I have are as following:
Δx= 32m
Δt= 1.2s
(pretty obvious)
I calculated the average velocity to be 26.66m/s using the formula v=Δx/Δt. Thus,making the final velocity 53.33m/s? Yes/no? For acceleration, I got 5.53m/s^2, but it just doesn't add up.
Above all else, I find the initial speed question particularly confusing. Can one not assume that the arrow began with an initial speed of 0m/s since it was in a resting state? Or is one supposed to assume the initial speed is the speed the arrow reaches almost instantaneously after it is launched?
I'd greatly appreciate any help.
Thank you