Posted by **Jenny** on Monday, November 29, 2010 at 11:40pm.

A 250-gram pendulum bob is initially constrained at a 53 degree angle by two strings. When the horizontal string is cut the pendulum begins to swing. As the pendulum bob passes through its equilibrium position, what will be its velocity?

- Physics -
**MathMate**, Tuesday, November 30, 2010 at 12:01am
Gravitational potential energy mgL(1-cos(θ) will be transformed into kinetic energy, (1/2)mv², where L=length of pendulum string,

θ=angle with vertical,

g=acceleration due to gravity

m=mass of pendulum (cancels out, so does not change answer)

Equate the two energies and solve for v.

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