Its acceleration points straight down at all times after it's released.
Throughout its flight the acceleration is downwards - towards the centre of the earth.
it is pointing down in the direction of gravity and is equal to the acceleration of gravity
The acceleration is the acceleration of gravity, downwards, or 9.8m/s/s (32 ft/s/s). When ball is thrown straight up it has an initial velocity that is decreasing because of gravity; at the highest point velocity is zero but acceleration is always constant at gravity rate.
0 zero
You can use Newton's equations of motion: At the top of the climb its velocity u = 0 m/s Its acceleration is acceleration due to gravity a ≈ 9.8 m/s Time of descent t = time of ascent = 3.00 s (I'll assume positive is towards the ground) v = u + at ≈ 0 m/s + 9.8 m/s² × 3.00 s = 29.4 m/s HOWEVER, this is the velocity (towards the ground) reached when the rock has returned to height from which it was thrown (released) above the ground - unless the rock was "thrown" by an explosive force at ground level, the rock will not have reached the ground at this point: there is still the distance from which it was "thrown". Which means its final velocity at ground level can be found using: v² = u² + 2as v = velocity it hits the ground u ≈ 29.4 m/s (as found above) s = distance above ground from which the rock was "thrown" = height_of_throw m a = acceleration due to gravity ≈ 9.8 m/s → v² = u² + 2as → v ≈ √((29.4 m/s)² + 19.6 m/s² × height_of_throw m) = √(864.36 + 19.6 × height_of_throw) m/s
If it is thrown at an angle, at the top of its path, its vertical velocity will be zero, however its horizontal velocity will be the same as its initial horizontal velocity minus whatever loss in speed as a result of air friction at that point. We won't know what that is without more information.
When the stone reaches its highest point, earth's gravity ensures it has to come down.
The acceleration is the acceleration of gravity, downwards, or 9.8m/s/s (32 ft/s/s). When ball is thrown straight up it has an initial velocity that is decreasing because of gravity; at the highest point velocity is zero but acceleration is always constant at gravity rate.
No, the acceleration at the highest point is never 0.
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A graph that shows speed versus time is not an acceleration graph.The slope of the graph at any point is the acceleration at that time.A straight line shows that the acceleration is constant.
You can use Newton's equations of motion: At the top of the climb its velocity u = 0 m/s Its acceleration is acceleration due to gravity a ≈ 9.8 m/s Time of descent t = time of ascent = 3.00 s (I'll assume positive is towards the ground) v = u + at ≈ 0 m/s + 9.8 m/s² × 3.00 s = 29.4 m/s HOWEVER, this is the velocity (towards the ground) reached when the rock has returned to height from which it was thrown (released) above the ground - unless the rock was "thrown" by an explosive force at ground level, the rock will not have reached the ground at this point: there is still the distance from which it was "thrown". Which means its final velocity at ground level can be found using: v² = u² + 2as v = velocity it hits the ground u ≈ 29.4 m/s (as found above) s = distance above ground from which the rock was "thrown" = height_of_throw m a = acceleration due to gravity ≈ 9.8 m/s → v² = u² + 2as → v ≈ √((29.4 m/s)² + 19.6 m/s² × height_of_throw m) = √(864.36 + 19.6 × height_of_throw) m/s
If it is thrown at an angle, at the top of its path, its vertical velocity will be zero, however its horizontal velocity will be the same as its initial horizontal velocity minus whatever loss in speed as a result of air friction at that point. We won't know what that is without more information.
When the stone reaches its highest point, earth's gravity ensures it has to come down.
0 ms-2 upwards
At the highest point, the kinetic energy is least.
For example, an object thrown upwards, when it is at its highest point. This situation is only possible for an instant - if the acceleration is non-zero, the velocity changes, and can therefore not remain at zero.
It is the second derivative of its distance from a fixed point on the line, with respect to time. There is nothing in the question which entitles you to assume that the acceleration is uniform.
The only force acting on a projectile once launched is gravity. So the acceleration of any object launched at any angle is the acceleration due to gravity, -9.8m/s2.