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February 28, 2015

February 28, 2015

Posted by **Emily** on Sunday, September 12, 2010 at 8:46pm.

- physics -
**bobpursley**, Sunday, September 12, 2010 at 9:02pmenergy in spring: m*g*h

velocity of the ball= sqrt 2gh check that.we will use this later.

now calculate the time in air launched at 34deg

hf=hi+Vi*sin34*time-4.9time^2

solve for time in air, t.

horizontal distance= Vi*cos34*t

- physics -
**Emily**, Sunday, September 12, 2010 at 10:09pmmy answer for this question came out to be 1.16 m. However when I plug it into the Physics homework program it say incorrect.

My equation for t was:

1.25 m = 0m + 4.952sin34t - 4.9t^2 and then I did the quadratic equation and got t= .28258

I then did the horizontal distance equation using 4.952 as my Vi.

What am I doing wrong where I still don't get the correct answer?

- physics -
**Morgan**, Thursday, September 15, 2011 at 4:33pmThe way to solve this is to use potential and kinetic energy and the formula R = (v^2/g)sin2(theta).

mgh=(1/2)mv^2

v=sqrt(2gh)

R=(sqrt(2gh)^2/9.8)sin2(theta)

= ((4.95)^2/9.8)sin(2*34)

=3.27m

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