Where is the potential energy of the roller coaster the lowest?

(a)

(b)

(c)

(d)

D

Explanation:

The potential energy of an object depends on its mass, the acceleration of gravity and the height above the surface of the earth to which it is located.

Potential Energy (U)

where m is the mass, g is the acceleration of gravity and h is the height.

Since the mass is the same at all points and g is also the same, the point with the lowest potential energy should be the point that is at the lowest height, wich is point D.

answer; (d) spontaneous processes are characterized by the overall conversion of order to disorder;

the chart show the masses and velocities of two colliding objects that stick together after a collision.

according to the law of conservation of momentum, the momentum of the object after the collision is  

answer

1,500

kg • m/s.