(adsbygoogle = window.adsbygoogle || []).push({}); HELP!!!A problem on oscillation

The problem statement, all variables and given/known data

the equation of motion of an object is y(t)=2.0cos(0.5t+pi/4)meter

a) Find its maximum acceleration and maximum speed, and its position at the time of these maxima.

b) what is the speed of the object when it is +1.2m from its equilibrium position?

c) what are the kinetic potntial and total energies at that point?

The attempt at a solution

a) for this part I don't reall understand what does the question mean by the maximum, is it when cos equals to 1?

b) derive 2.0cos(0.5t+pi/4), which equals to -2sin(0.5t+pi/4)*0.5=-1sin(0.5t+pi/4)

then plug the 1.2 into the unknown variable, which equals to -sin(0.5*1.2+pi/4)=-0.98 I don't really think it is the correct solution for this part

c) I have to find out the correct v from part B and plug into both kinetic and potential energy equation, but I have one more problem here, which is how do i get mass for this question?

P((1/2mv^2)i) + K(1/2mv^2)i) = P((1/2mv^2)f) + K(1/2mv^2)f)

Thank you for helping me.

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# Homework Help: HELP A problem on oscillation

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