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Old Sep 27th 2010, 05:54 PM   #1
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Join Date: Nov 2009
Posts: 94
Time is not working out

Hey There,
A golf ball rolls off a horizontal cliff with an Vo speed of 11.4 m/s. The ball falls a vertical distance of 15.5 m into a lake below.
It asks a) how much time does the ball spend in the air
b) what is the speed v of the ball just before it strikes the water?

I solved for B the V as 20.82 m/s.w
I got Vo = -11.4, d = -15.5 m, a= -9.8 m/ss.

I tried every way to get time of 1.78 s using all formulas that I can and for some reason I am coming up short in time.
What am I doing wrong. Just pluncking the numbers and nothing.
HELP?
Tks
bradycat is offline   Reply With Quote
Old Sep 28th 2010, 12:04 AM   #2
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Join Date: Dec 2008
Location: Udupi, Karnataka, India
Posts: 292
Originally Posted by bradycat View Post
Hey There,
A golf ball rolls off a horizontal cliff with an Vo speed of 11.4 m/s. The ball falls a vertical distance of 15.5 m into a lake below.
It asks a) how much time does the ball spend in the air
b) what is the speed v of the ball just before it strikes the water?

I solved for B the V as 20.82 m/s.w
I got Vo = -11.4, d = -15.5 m, a= -9.8 m/ss.

I tried every way to get time of 1.78 s using all formulas that I can and for some reason I am coming up short in time.
What am I doing wrong. Just pluncking the numbers and nothing.
HELP?
Tks
Vo = 11.4 m/s is in the horizontal direction.The vertical component of the initial velocity is zero.
sa-ri-ga-ma is offline   Reply With Quote
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