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**Here is the question:**

A spring is compressed 20cm. When it is released, it exerts an average force of 57.2 N on a 7.3 kg rock, shooting it across a frictionless floor. Determine the speed of the rock as it leaves the spring.

A spring is compressed 20cm. When it is released, it exerts an average force of 57.2 N on a 7.3 kg rock, shooting it across a frictionless floor. Determine the speed of the rock as it leaves the spring.

## Homework Equations

W=change in energy

Work energy theorem

W=Fd

## The Attempt at a Solution

W=Fd

=(0.20cm)(57.2N)

=11.44J

W= change in EP elastic

=1/2kx^2

Rearrange formula to solve for k (spring constant)

=10.69579357 N/m