A 1.2 kg mass starts from rest at point A and moves along the x-axis subject to the potential energy shown in the figure below. PE 30 J 25 J C 20 J 15 J D 10 J 5 J B X 2m 4m 6m 8m 10m (a) Determine the speed (in m/s) of the mass at points B, C, D. (For each answer, enter a number.) point B n/s point C m/s point D m/s (b) Determine the turning points for the mass. (Select all that apply.) point A point B point C point D point EA man on a motorcycle plans to make a jump as shown in the figure. h If he leaves the ramp with a speed of 38.5 m/s and has a speed of 36.1 m/s at the top of his trajectory, determine his maximum height (h) (in m) above the end of the ramp. Ignore friction and air resistance. m