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(a) What is the force constant of this spring? ____ N/m

(b) For what length of time is the block in contact with the spring before it comes to rest? ___s

For part a:

Since the formula for a force constant is f=-kx, and the problem doesn't give a k value, I tried solving for it using:

k=(mg)/x and got

k=(.650kg*9.81)/.25 m

k=25.50g

and plugged this into f=-fx

and got f=-6.3765

For part b:

im not even sure where to start ..