Work - Energy Problem confusing

I find this confusing :s

Ref: Engineering Mechanics: vol 2 dynamics J L Meriam and L G Kraige, 3rd Edition, Wiley

Okay, W-E Use the formula:

No friction and N is always perpendicular to motion, so there is no work done.

We should be able to find Velocity by substituting into the equation and making W(1-2) = 0

I don't understand how we are supposed to find part B, assuming part A is correct?

wah this is a very nice and interesting question!!!!

to find part b, I think we need to take into account a bit of circular motion... just a hunch only...

means...

mv^2/r (using your v from part i) = normal force + kx (force due to spring) - weigh of slider

try and see if u get the answer ;)

ohh i just got pwned, how do u take into account circular motion.. it cant be right :S shouldnt work energy cover it already?

repeat post*

shouldnt work energy cover it already?

You already mentioned this mah:

N is always perpendicular to motion, so there is no work done.

;)

yeah! so W(1-2) = 0

ok game over hahaha ill take another look tomorrow

OK i managed to do part a)

v = 5.92 m/s

Essentially we use the W-E equation,

W(1-2) = Delta T + delta Vg + delta Ve

so i get

0 = 0.5(0.6)V^2 + 0.6(9.81)(-0.5) + (60)(0.05^2 - 0.35901^2)

which solves for our V.

However... im absolutely screwed over for part b...

help any1 :S?

wait for b , ... n-t coordinate system.. ?

or must u use work -energy