(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Given

hb (m) = 1 (Height of point B)

theta = 30 (degrees - launch angle)

k (N/m)= 60 (assume the graph is linear)

m (g) = 250 (balloon mass)

1. If Xs (cm) = 150 (pull distance)

a) Find the estimated Vb and the landing X (ideal case where Ein =Eout)

b) The balloon land 160 ft away. Find the actual Vb for the shot.

Find also the Eout and the efficiency of the launcher.

2. Relevant equations

1/2kx^2

mgh

1/2mv^2

3. The attempt at a solution

dont know how to solve for a)...not sure with the what i am doing. any hint on what formula i should be using?

for b, i put ft into m, so x = 48.7656m and used it to find time, t = 2.439s, which is then use to find Vb, Vb = 23.087m/s

so how exactly do i solve for a) and find Eout and the efficiency ?

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# Homework Help: Water Balloon Launcher

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