- #1
BrainMan
- 279
- 2
Homework Statement
Homework Equations
xf = x0 + v0cos(θ)t + (1/2)axt2
yf = y0 + v0sinθt - (1/2)gt2
F = ma
The Attempt at a Solution
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I first tried to find the acceleration in the x direction so I could solve for the force
xf = x0 + v0cos(θ)t + (1/2)axt2
In order to find the time I used the equation for the y coordinate
yf = y0 + v0sinθt - (1/2)gt2
The initial and final y positions will both be zero so
0 = 0 + v0sin(θ) - (1/2)gt2
t = 2v0sin(θ)/ g = .702 sec
Then I plugged time back into the x equation
2.9 = v0cos(θ)(.702) + (1/2)a(.702)2
a = -2.23
Since I know the acceleration I can find the force by Newtons second law
F = ma
F = .015(-2.23) = -.033 N
It appears that I am a sign off from the correct answer