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- what is the speed of the block as it passes through its equilibrium position?
- at what rate is the spring doing work (power) as the block passes through the equilibrium pont?
- what is the maximum compression of the spring?
- at what rate is the spring doing work on the block as the block passes through a point 5 cm away from the sprig's equilibrium position and being stretched?

## The Attempt at a Solution

1.

I know this is wrong but

do I use K - 1/mv2

20 =.5*.50*v

^{2}

v -8.9 m/s

I missed my lecture the day when his was taught, I dont have any idea how to solve any of this ... can you please help me??