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Old Apr 20th 2018, 08:27 PM   #1
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Post Basic Physic Problem -Accelaration due to Gravity

A baseball is thrown straight up with a speed of 13.2 m/s.

How fast is the baseball after 2.00 sec?

In which direction is the ball traveling at this point?
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Old Apr 21st 2018, 12:03 AM   #2
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v= u + gt
u is the initial velocity .....g= 9.81 m/sec squared v is final velocity ... this is the only equation you need...

Make sure you get your signs correct , gravity is slowing down the ball so if initial velocity u is +13.2 , then gravity is - 9.81 ...

or you can have it the other way round u=-13.2 then gravity must be +9.81

The sign of v , + or - , will show which direction it's moving.
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Old Apr 21st 2018, 12:42 AM   #3
Pmb
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Originally Posted by oz93666 View Post
v= u + gt
u is the initial velocity .....g= 9.81 m/sec squared v is final velocity ... this is the only equation you need...

Make sure you get your signs correct , gravity is slowing down the ball so if initial velocity u is +13.2 , then gravity is - 9.81 ...

or you can have it the other way round u=-13.2 then gravity must be +9.81

The sign of v , + or - , will show which direction it's moving.
Oz. Why are you doing someone's homework for them? By now you surely mus know that (1) you're not preparing them to take exams and (2) you're violating the forum rule on this point.
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Old Apr 21st 2018, 02:11 AM   #4
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Originally Posted by Pmb View Post
Oz. Why are you doing someone's homework for them? By now you surely mus know that (1) you're not preparing them to take exams and (2) you're violating the forum rule on this point.
I hardly did their homework , not even a hint of an answer ... just pointed out the equation , and pushed them in the right direction.

It's the help I hope any father would give to his son , saying what is necessary for the student to do the work.

What then is the correct response ??? just ignore the request???

Last edited by oz93666; Apr 21st 2018 at 02:15 AM.
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