Which statement correctly describes the differences between positive and negative acceleration? positive acceleration describes a change in speed; negative acceleration describes no change in speed. positive acceleration describes no change in speed; negative acceleration describes a change in speed. positive acceleration describes an increase in speed; negative acceleration describes a decrease in speed. positive acceleration describes a decrease in speed; negative acceleration describes an increase in speed.

Positive acceleration describes an increase in speed; negative acceleration describes a decrease in speed.

Explanation:

Acceleration is defined as:

where

v is the final velocity

u is the initial velocity

is the time taken for the change in velocity to occur

The value of is always positive, so the sign of the acceleration depends on the numerator. More specifically, we have two situations:

- if , then it means that the final velocity is greater than the initial velocity, so the acceleration is positive and the speed is increasing

- if , then it means that the final velocity is smaller than the initial velocity, so the acceleration is negative and the speed is decreasing

the force on the thing and the distance the force moves the thing

jupiter is the largest planet in our solar system, having a mass and radius that are respectively, 318 and 11.2 times that of earth. suppose that an object falls from rest near the surface of each planet and that the acceleration due to gravity remains constant during the fall. each object falls the same distance before striking the ground. determine the ratio of the time of fall on jupiter to that on earth.