Acceleration in free fall: find final velocity and height

  • Thread starter Firebird
  • Start date
  • #1
10
0

Homework Statement


A student drops a ball from the top of a tall building; it takes 2.5 s for the ball to reach the ground.

A.What was the ball’s speed just before hitting the ground?
B.What is the height of the building?


Homework Equations


v=V(not) + at

x=V(not)t + 1/2at(Squared)

V(Squared) =V(not) + 2ax




The Attempt at a Solution



I wrote the following

V(not) = ?
a= 9.80 (Because it is a free fall question?)
t= 2.5
v= ?
x= ?

I think I am missing a variable but I do not know which one.

thanks


EDIT: Will I have to do A2+B2=C2?

If so what will be the legs and what will be the hyp?
 

Answers and Replies

  • #2
179
0


x=V(not)t + 1/2at(Squared)

There is only one unknown in this equation.

and this v=V(not) + at
 
  • #3
10
0


x=V(not)t + 1/2at(Squared)

There is only one unknown in this equation.

and this v=V(not) + at
How do I figure out the other varibles
I have a and t only how do I figure out the 3rd one?
 
  • #4
179
0


Vo or V(not) is your initial velocity. In the problem it says that the student drops the ball, what does that mean according to the initial velocity?
 
  • #5
10
0


I got it
I got it
I got it
I got it
I got it



Yeah!

Thanks for your help man!
 

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