Homework Help: Physics

Posted by Rebecca Niles on Monday, December 6, 2010 at 6:51am.

if a ball is thrown vertically into the air, leaving the ground at a height of 1.8m, with a speed of 9.7m s -1. When it rises and falls to the ground what will the balls speed be as it hits the ground? please help with an explanation as i am so stuck, my exam is in two days and i need help.
thanx
Becky

Physics - bobpursley, Monday, December 6, 2010 at 8:56am
I would do this with energy.

Final total energy=initial total energy

1/2 m vf^2+zeroPE=mg(hi)+1/2 mvi^2

Vf^2=2g*1+vi^2

you may have had this formula presented to you for memory as..
Vf^2=Vi^2+2ad
Physics - Rebecca Niles, Monday, December 13, 2010 at 4:45am
Thank you Bob Pursley :)

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