# Simple harmonic motion block and spring

## Homework Statement

A block, attached to a spring, is set into vertical oscillation with an amplitude of 25.0 cm and a frequency of 5.00 Hz. At t = 0.00 s, the block is 14.0 cm below the equilibrium position and is moving upwards. Assume that the displacement from equilibrium is given by
y = ym cos(ω t + φ ) , with y positive upwards.
Calculate the phase angle, φ.

## Homework Equations

ive been using the equation that was given to me in the question, using 0.14m as my y, 0.25m as my ym, 0 as my t therefore w isnt needed? and i have a frequency??? im lost....please help lol

i am arriving at (b).....if this helps at all

## The Attempt at a Solution

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turin
Homework Helper
Did you use the fact that the block is moving upwards? Here's a hint: what is the numerical difference between b and c? Does it look familiar?

pi lol.....do i have to add pi? confusion

turin
Homework Helper
do i have to add pi?
That was only a hint. Forget about $\pi$.

EDIT: Your y is wrong. Can you tell me why? (haha)

EDIT: EDIT: Wait a minute! THEIR y is wrong! Are you sure you copied every word of the problem correctly?

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