The total energy of the roller coaster is 39,815 joules at the top of the largest hill. If the car has a mass of 188kg and at point B you are 7.6 m off
the ground. What is the velocity at that point?

Attach the free body diagram and i will you answer the question.! : d

Year  1936,  lehman predicted that the earths 'inner core' is solid. she observed that the seismic signals during her study were bent and did not pass through instead bouncing back. later it was confirmed that the earth's inner core was solid made up of nickel-iron and had a molten outer core.