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## Homework Statement

A block of unknown mass is attached to a spring with a spring constant 9.00 N/m and

undergoes simple harmonic motion, along the x axis, with an amplitude of 10.0 cm. When the

mass is halfway between its equilibrium position and its maximum positive displacement, its

velocity is measured to be +30.0 cm/s. Calculate

(a) the mass of the block,

## Homework Equations

??

## The Attempt at a Solution

I tried using the x= A cos (ωt +∅) but i can't figure it out without time. HELP?? I know the answer is suposed to be m= 0.750kg but i don't understand how to get there.