Plssssss help, sorry for the trouble

Question

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Thank you!!!!!

Answer 1

Point C: mv_A²/2 + mgh_A = mv_C²/2 + mgh_C; v_C = (2gh_A + v_A² - 2gh_C)^1/2 = (2·9.8·20 + 4 - 2·9.8·6)^1/2 = 16.65 m/s;

Point E: mv_A²/2 + mgh_A = mv_E²/2 + mgh_E; v_E = (2gh_A + v_A² - 2gh_E)^1/2 = (2·9.8·20 + 4 - 2·9.8·10)^1/2 = 14.14m/s