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Can anyone confirm or adjust my answers for problems 12 and 14? Also can someone help me start on problem 13.. Thanks guys I really appreciate the help

1. The problem statement, all variables and given/known data

012

Find the speed of the block when it is 2.5 cm

from the equilibrium position.

Answer in units of m/s.

013

Find its acceleration at 2.5 cm from the equilibrium position.

Answer in units of m/s2.

014

Find the time it takes the block to move from

x = 0 to x = 2.5 cm.

Answer in units of s.

2. Relevant equations

M= 0.7kg

k= 14.7 N/m

A= 5cm

w= 4.58 rads/s

T= 1.37s

3. The attempt at a solution

#14: x(t) = 5cm Cos(4.58rads/s*(t))

t= (1/4.58 rads/s) cos^-1 (2.5cm/5cm) =??13.09s

do I convert it to meters??

#12: E=1/2mv^2 + 1/2kx^2 = 1/2ka^2

1/2(.7)v^2 + 1/2(14.7)(.025m)^2 = 1/2(14.7)(.05m)^2

.35v^2=.0137

v=0.1984m/s

I changed the cm to m, I should have done this right??

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# Homework Help: Confirm my answers on Oscillating Springs?

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