A rock has the same constant acceleration from the moment it leaves your hand
until the moment it hits the ground. It doesn't matter whether you dropped it or
threw it, or in what direction it left you.
The acceleration is 9.8 meters (32.2 feet) per second2 directed downwards.
That's the acceleration of gravity on earth.
As you asked, let's say you tossed it straight upwards. A tiny instant before it
reaches the exact top, it has a small upward speed. A tiny instant after it passes
the exact top, it has a small downward speed. During that tiny space of time, its
upward speed decreases and its downward speed increases. That's a downward
acceleration in anybody's book.
Zero. "Terminal velocity" means that the object is no longer accelerating; the downward force of gravity and the upward force of resistance are in balance.
When an object is at terminal velocity, the two forces due to gravity and drag are equal, so the object ceases accelerating. Its motion is constant and vertically downward.
The slope of a straight line tells the rate at which your variables are changing. In this case, it tells you how your velocity is changing over time, which in physics is how we define acceleration. If you graph the velocity of an object vs time when it is falling through the air, it gives to the acceleration due to gravity because that is the acceleration all objects fall at.
Yes, the acceleration due to gravity always points vertically downward, regardless of the direction of an object's velocity. This is because gravity is a force that attracts objects towards the center of the Earth.
If the net force acting on an object is 0, then the object will move with a constant velocity. This means that the object will neither speed up nor slow down, but continue to move at a consistent speed in a straight line. This is described by Newton's first law of motion.
At the highest point, the velocity of an object thrown vertically into the air is momentarily zero as it changes direction. This is the point where it transitions from going upward to downward.
Downward velocity refers to the speed at which an object is falling towards the ground or moving in a downward direction. It is commonly measured in units such as meters per second or feet per second. A positive downward velocity indicates the object is accelerating downward, while a negative velocity means the object is moving upward.
At that moment, its vertical velocity is zero. Its horizontal velocity may or may not be zero, i.e., it may be moving sideways as well.
When the upward and downward forces on a falling object are equal, the object reaches terminal velocity. At terminal velocity, the object stops accelerating and falls at a constant speed.
When an object is thrown upward, the acceleration due to gravity acts downward while the velocity is directed upward. This leads to a decrease in the speed of the object until it reaches its highest point and changes direction.
The velocity of such an object changes all the time. Assuming you throw something directly upwards and there is no wind, it will go upwards, slower and slower, until it reaches its highest point. At that moment, its velocity is zero. Then, still as a result of gravity, it will move downward, faster and faster.
When an object is falling at terminal velocity, the forces of gravity pulling it downward and air resistance pushing upward are balanced. This results in a constant velocity for the object as it falls.
If you through an object up, at its highest point it will have zero velocity (only for that instant). But all the time it is subject to an acceleration of 9.8 meters per square second (downward).
terminal velocity
The velocity versus time graph would be a straight line sloping downward. The velocity would start at 0 when the object is released, then increase linearly in the negative direction as it accelerates due to gravity.
Terminal Velocity.
At the highest point in a projectile's motion, the velocity is zero because it has come to a momentary stop before starting to fall back down due to gravity. This is the point where the vertical velocity changes direction from upward to downward.