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A ball is thrown vertically upward. What are its velocity and acceleration when it reaches its maximum altitude What is the acceleration of the ball just before it hits the ground?
Wiki User
∙ 7y ago
At the maximum height the ball will be completely stopped from moving upward or downward; thus the speed of the ball would be 0 mph. The ball is only stopped for a split second and then it begins moving downward, then increasing at 9.81m/s^2 until it reaches maximum velocity.
Wiki User
∙ 14y ago
Wiki User
∙ 14y agoIf a ball, or any object, is thrown vertically it will always be accelerating downwards at a rate of 9.8 m/sec2 until it hits something. Because it starts with an upward velocity, this acceleration slows it down until it has zero. This is obviously the point of maximum height. After this it will start downwards always with the same acceleration. After a second from its maximum height, it will have a velocity of 9.8 m/sec. This is actually only a close approximation because it assumes the acceleration due to gravity is constant. The ball is moving through the air and so its acceleration when it has a velocity of zero will be greater than when it is moving. It also does not account for the fact that the further away from the earth you go, the less the force of gravity. Sir Isaac newton developed a branch of mathematics called the calculus simply to explain the true motion in such circumstances. For a ball thrown vertically though, the difference is so small it would be extremely difficult to measure. The heavier the object of the same size, the closer to the motion described above.
Wiki User
∙ 12y agoWhen a ball is tossed straight up . . .
-- The acceleration is 9.8 meters per second2 downward, from the time the ball
leaves your hand until it hits the ground. The acceleration doesn't change.
-- The velocity is zero with an arbitrary direction when the ball is at its highest point.
Wiki User
∙ 9y agoIts speed decreases at a nearly constant rate of decrease in speed. When a body is in motion due to gravitational force alone, it has constant acceleration downward ... the "acceleration due to gravity". If its velocity is upward, and its acceleration is downward, then the result is a decrease in speed.
Wiki User
∙ 7y agoIf you ignore air resistance, the acceleration is about 9.8 meters per second squared, downward - all the time (until it hits the ground).
The velocity at its highest point, of course, is zero.
Wiki User
∙ 12y agoAnything that you throw out into space ... whether you throw it up, down, or sideways,
or just drop it ... has the same, constant acceleration from the time it leaves your hand
until the time it hits the ground. That's the acceleration of gravity:
9.8 meters (32.2 feet) per second2 directed downward.
The speed and velocity both change. But the acceleration doesn't.
Wiki User
∙ 14y agoThe velocity & acceleration will be taken as negative when a ball is thrown upward because work is done against the gravity.
Wiki User
∙ 14y agoIt will be stationary as it stops moving upward and then starts to drop.
Wiki User
∙ 10y agodistingusih between velocity and accerlation, and apply each to a ball tossed straight upward
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