(11%) Problem 6: Two masses sit at the top of two ictiouless inclined planes that have different angles, as shown in the re. Part (a) What can be said about the speeds of the two masses at the bottom of their respective paths? 0 Cannot determine. 0 Ball one is traveling faster. 0 The two balls are traveling the same speed. 0 Ball two is traveling faster. Part (b) Which mass gets to the bottom first? O Cannot determine. O Mass one. O Mass two. They both take the same amount of time.Problem 7: A ball is dropped in a vacuum (no air resistance). As it falls it loses 7 J of potential energy. How much kinetic energy did it gain? O Less than 7 J O It cannot be determined. O7 J O More than 7 J(11%) Problem 8: A tennis ball of mass m = 0.053 kg is thrown straight up with an initial speed v0 = 5 m/s. Let the gravitational potential energy be zero at the initial height of the tennis ball. Part (a) What is the maximum height, / in meters, the ball reaches? Part (b) What is the work done by gravity, W. in Joules, during the ball's flight to its maximum height?) Problem 9: A roller coaster car has a speed of v0 = 6.9 mfs as it tops the crest ofa h = 38.5 In drop. :I What is the car's speed at the bottom of the drop, vfin III/s