Posted by **Anonymous** on Tuesday, January 5, 2010 at 7:44pm.

A frictionless pendulum of length 3 m swings

with an amplitude of 10◦. At its maximum

displacement, the potential energy of the pendulum is 10 J.

What is the kinetic energy of the pendulum

when its potential energy is 5 J?

1. K = 10 J

2. K = 3.3 J

3. K = 6.7 J

4. K = 15 J

5. K = 5 J

- physics -
**Kyle**, Sunday, December 8, 2013 at 1:22pm
5. K =5 J

since the only force acting on it is gravity, it's a conservative force. That means the energy is only transferred from U to KE and never lost.

We use the formula:

E= U + KE

At its max displacement, KE=0 and E must equal U. It says that at its max displacement U=10J so at that point E also equals 10J.

So if E=10 and U=5, KE=?

E= U+KE

10=5+KE

KE=5J

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