4. (20 points) In the figure, a block of mass m = 0.551 kg on an l n an inclined is pushed against the spring until the spring is compressed x - 0.120 m and released from rest. The block leaves the spring and slides along a frictionless unless circular loop of radius R = 0.200 m, then moves a distance d - 0.500 m or m on a surface with W/k - 0.321. if the spring constant k - 720 N/m, L - 1.21 m, and 0 - 220. (a) What is the speed of the block at point A ( at the top of the loop)? (b) What is the speed at point ? (e) If the spring compressed and released from rest and the block was at the verge of losing contact on point A, what is the value of x? 551 Kq som julie = 0-321 m 220( ( mg ( x z t L ) s in 8- 0 j + 80 - fic, x 2 ] + [ k k x 2 - 0] + 0 Jug + AUs,+ AVs, + AK