Correct answer only !

as a roller coaster goes downhill

a) kinetic energy is converted into potential energy.

b) potential energy is converted into kinetic energy.

c) electrical energy is converted into potential energy.

d) potential energy is converted into electrical energy.

The x-coordinate of a particle in curvilinear motion is given by x = 3.1t3 - 4.9t where x is in feet and t is in seconds. the y-component of acceleration in feet per second squared is given by ay = 2.3t. if the particle has y-components y = 0 and vy = 5.0 ft/sec when t = 0, find the magnitudes of the velocity v and acceleration a when t = 1.8 sec. sketch the path for the first 1.8 seconds of motion, and show the velocity and acceleration vectors for t = 1.8 sec. answers: v = ft/sec a = ft/sec2

Suppose while hauling rocks, you accidentally drop one. it breaks apart in flat, planar sections. what type of rock did you just drop? 20 points

Acar drives toward the right over the top of a hill, as shown below. which arrow represents the centripetal acceleration? w x y z