I am studing for my science final.Physics is my weakness.Have so much problemsOn what formula to use!! Could you help and explain 19, 20 and 21xThought it was easier to send as 1.Sorry if not allowed.

Use the following information to answer the next three questions Pierre Lueders from Edmonton, Alberta, is a world and Olympic champion in the two- man bobsled event. Lueders trains at one of the world's most challenging runs located in Calgary Alberta. The bobsled run at the Calgary Olympic Park has a length of 1500 m and a height of 121 m. 19. A bobsled including its riders, has a mass of 250 kg, how much potential energy doe the bobsled have as it is about to start its run? a. 297 MJ C. 29.7 MJ Fd b. 297 kJ d. 297 J 20. If all the potential energy from the bobsled is converted into kinetic energy as the bobsled speeds past the finish line, what is the bobsled's velocity? a. 2374.0 m/s c. 48.7 m/s b. 97.4 m/s d. 1187.0 m/s 21. Although this potential energy is converted into kinetic energy, some potential energy is a. Evaporated into the atmosphere 1001 2070 16 b. Converted to mass c. Conserved as potential energy d. Lost through friction 22. A race car races a 100 m sprint track at an average speed of 9.50 m/s. If the car's kinetic energy is 9.40 x 10'J what is its mass? a. 1.98 x 10' m/s b. 208 kg c. 104 kg d. 52.1 kg