HELP!! The Twister and Runaway Train are two coasters at the same amusement park. Both coasters start at the same height. The coaster for the Twister is twice the mass of the coaster for the Runaway Train. Which roller coaster has greater gravitational potential energy at the start of the ride?

A. Both coasters start with the same amount of potential energy.
B. The Runaway Train
C. The Twister

Which of the following is an example of units for speed

Aparticle moves in the xy plane with constant acceleration. at time zero, the particle is at x = 6 m, y = 8.5 m, and has velocity ~vo = (9 m/s) ˆı + (−2.5 m/s) ˆ . the acceleration is given by ~a = (4.5 m/s 2 ) ˆı + (3 m/s 2 ) ˆ . what is the x component of velocity after 3.5 s? answer in units of m/s.

Two students, each riding bicycles, start from the same apartment building and ride to the same building on campus, but each takes a different route. the first student rides 1100 m due east and then turns due north and travels another 1430 m before arriving at the destination. the second student heads due north for 1930 m and then turns and heads directly toward the destination.at the turning point, how far is the second student from the destination?