a projectiles problem

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omartharwat

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Jun 14, 2022
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a ball is projected vitically from the top of a building with hight of 45 m from Erath`s surface . it velocity is determind by the relation v= 40-10t how much time the ball will take to hit the ground?
 
omartharwat said:
a ball is projected vitically from the top of a building with hight of 45 m from Erath`s surface . it velocity is determind by the relation v= 40-10t how much time the ball will take to hit the ground?
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When does the speed became zero?

How can you use that knowledge to solve the given problem?
 
This problem disturbs me. I can't wait to see the answer (using only trig and geometry).
 
Steven G said:
This problem disturbs me. I can't wait to see the answer (using only trig and geometry).
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Steve, please cut out the sarcasm. This problem can be solved using Galileo's equation s and algebra.

You do know those equations - taught in H.S. Physics!?
 
Subhotosh Khan said:
Steve, please cut out the sarcasm. This problem can be solved using Galileo's equation s and algebra.

You do know those equations - taught in H.S. Physics!?
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I do know Galileo equations (from College physics--I wanted to learn Physics from a physicist not from a high school teacher).
The real question is does the OP's teacher know Galileo equations?
 
Steven G said:
I do know Galileo equations (from College physics--I wanted to learn Physics from a physicist not from a high school teacher).
The real question is does the OP's teacher know Galileo equations?
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No, the real question is does the OP know the Galileo equations? I'm guessing the teacher is qualified. Virtually all of them are. But I don't really care about the OP's teacher. It's more than likely that the OP simply put the question in the wrong Forum category.

-Dan
 
Hmmm. You all appear to be missing something here. The ball will never reach the ground!

If by "vitically" the OP meant "vertically" ( I can't think what else s/he might have meant) then the ball will rise (for 4 seconds) and then fall straight back down again coming to rest back on the top of the building! ?
(Of course, if the OP really meant to write "horizontally" then that's a different kettle of fish! ?)

Yours Aye,
A Physics Teacher.
 
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