# Homework Help: Pendulum problem

1. Apr 24, 2010

### physicshelp98

1. The problem statement, all variables and given/known data

a 2 kg pendulum of length 7 meters is moving at 1 m/s, calculate how high (h) the pendulum will rise; and the resultant angle.

2. Relevant equations
1/2mv2 = mgh

cos = Y/L

h = L ( 1- cos )

3. The attempt at a solution

1/2(2)(1)^2 = (2)(9.8) h
1 = 19.6h
1/19.6h
h = .051

just dont know how to go about gettign resultant angle

Last edited: Apr 24, 2010
2. Apr 24, 2010

### ideasrule

Have you tried drawing a diagram and writing out a trigonometric relationship using that diagram?

3. Apr 24, 2010

### physicshelp98

yeah i did and got h= 7 tan$$\theta$$, how would you find the actual angle that what im having difficult with.