If a tennis ball with a mass of 57 g is shot out of a spring cannon at a 45 degree angle and goes 10m find the answer to the following questions:
What is the velocity.
What spring constant must the cannon have.
What would be the constant converted into lbs/in.
vf^2=vi^2 + 2ax
The Attempt at a Solution
ok i started off with finding the vi
and with that then i can now try and find the acceleration of the spring right?
from 0 to 10m/sec
first question is this x referring to x as how far i must pull back the string or the distance that i will be shooting at? (10 m)
good so far?
then at this point I am supposed to guess a K and use that.
so a 20 lbs/in has 2.2597 N/m
( http://www.boltscience.com/pages/convert.htm )
so x = 1.12 m
so i would have to pull in back a meter?
if i set k to 31
x=.30 which is abt a foot right?
but 31 N/m is like almost 300 lbs/in spring!
what am i doing wrong?
Thanks for any input.