Question

Sung rolls a marble off the edge of a table. She rolls the marble off the same table again but at a different speed.

Which best describes the projectile motion of the marble as it leaves the table at the two different speeds?

The marble’s horizontal and vertical velocities change.
The marble’s horizontal and vertical velocities remain the same.
The marble’s vertical velocity changes, but its horizontal velocity does not.
The marble’s horizontal velocity changes, but its vertical velocity does not.

Answer 1

Answer: The correct statement is "the marble's vertical velocity changes, but its horizontal velocity does not change".

Step-by-step explanation:

Projectile motion is the kind of motion in which an object is thrown near the earth's surface under the action of gravity only. The path covered by the object is curved.

The acceleration due to gravity is acting along the vertical direction. There is no acceleration acting along the horizontal direction.

In the projectile motion, there are two components of the velocities- one is acting along the horizontal direction and the other is acting along the vertical component.

Therefore, the vertical velocity of the marble changes but its horizontal velocity does not change.

Answer 2

Correct answer choice is :

D) The marble’s horizontal velocity changes, but its vertical velocity does not.

Step-by-step explanation:

Projectile motion is a kind of change undergone by an object or particle that is submitted near the Earth's cover and runs along a rounded path under the act of gravity only. This curved way was given by Galileo to be a parabola. The regular segment of the speed of the object continues constantly during the motion. The vertical segment of the changes linearly, because the acceleration due to pressure is uniform. The accelerations in the x and y tracks can be combined to determine for the segments of velocity at any time t.