Question

+ -/1.66 points My Notes SerCP11 5.6.OP.036 5. The figure below shows a box with a mass of m friction. Point A is at a height of h 7.10 kg that starts from rest at point A and slides on a track with negligible = 7.00 m A 3.20 m 2.00 m (a) What is the box's speed at point B (in m/s)? m/s What is the box's speed at point C (in m/s)? m/s (b) What is the net work (in J) done by the gravitational force on the box as it moves from point A to point C? Need Help? Read It

Answer 1

Solution : ok According to the conservation Cengy (In absent of any non- conservative ture like friction), change * change in potential crogy - change in Kinetic neaty It Hare, * Inntial pokutal clogy A . C Vi= mgha h a . hu - Final potential crogy No= might - Initial Kinetic chaggy Ki=0 I final kinetic energy 2 kpl mur? kas loss in polertial cumpay = Eyvin is könndie consasy » mgha-might = 1 m2.0 yg Chacho) = B² Ve on 29 (hacha) 91

V = 1.297.8 64.212) 182, ).s Ver 8.62 m) (At punt e) & similarly for paint a Va-va = 1 m vc² mg Cha-be) - a mvc? Vc = J 29 (haha) Ve=1279.8(7-2) Vc = 9.89 mls & Network done by gravitational force a change in kinetic energy from Atoc. Theorany) ½ - 2 niver - ImVA? (from ook nera * * 7ol kay X (4:89)? *1 349.23