F7 F8 7 ) A roller coaster with a mass of 450 kg is at the top v = 8.0 mis of a 25 m hill. The car is initially traveling at 8 Y . m = 450 kg m/s at the top of the hill. What is the velocity of A the roller coaster at the top of the 2nd hill at a B height of 14 m? h = 25 m h = 14 m Ground 8) A 4.1 kg block is attached to a spring with a force constant of 550 N/m. It is originally compressed 25 cm. What is the velocity of the block when it is 15 cm past its natural equilibrium (meaning stretched 15 cm)? 9) A marble of mass 6.5 grams is at the top of a 75 cm tall ramp. There is a spring at the bottom of the ramp to keep the marble from crashing into the wall. What is the maximum compression of the spring if the spring has a spring constant of 10 N/m? 10) What is the velocity of the marble in the previous problem if the marble has only compressed the spring 2 cm