Question

A ball thrown in to the air starts out with an initial upward velocity but eventually slows and stops before falling back to the ground. Which of the following contributes the most to the change in the motion of the ball?Question 2 options: a) The initial force with which the ball was thrown b) The downward force of gravity c) The resistance against the atmosphere d) The increase of inertia.

Answer 1

Answer:

b) The downward force of gravity

Explanation:

The gravity force has the biggest influence on the deceleration of the ball because no matter how much force you applied on the ball, it will eventually go down again, according to newton's second law:

$\sum F=m.a$

right after you throw the ball, only the force exerted by the gravity will affect the ball (neglecting air resistance):

$m.g=m.a\\a=g$

so the object will eventually be going down again.