Please answer questions shown below

QUESTION 4 An 120 kg roller-coaster is released from rest at Point A of the track shown in the figure. Assume there is no friction or air resistance between Points A and C. How fast is the roller-coaster moving at Point B? (Input your answer in m/s using 3 significant figures) Consider only a part of the diagram from Point A to Point B and Ignor part BCD Figure It 140 m 120 mm 95 m BOEm a. 29.7 Ob. 9.49 Oc. 21.0 Od. 45.1 Oe. 65.6