an object was thrown vertically, at its highest point what is its acceleration be?

Answer 1

The acceleration due to gravity is a constant over some kilometers from the surface of earth.

When an object is thrown up, not only at the highest point but through out its path there is acceleration in the downward direction.

If above any point there is no acceleration then it will continue to move up and never will come down.

There is a misconception that if the speed is zero then the acceleration is zero.

If there is no acceleration at the highest point, then the object will be at rest always.

Through out it path there is acceleration.

Even after coming to stop on the surface of earth, it has acceleration. That is why all objects have weight.

If we hung an object in a string, the object pulls the string and then comes to rest. At this position also it has acceleration but its speed is zero.

Because of the acceleration it goes down when we cut the string.

In a simple pendulum the bob oscillates to and fro. In the highest position its speed is zero and in the equilibrium position its speed is the maximum. However the acceleration is always there in a downward direction.

In a simple way we can tell whenever there is a force there will be acceleration.

In earth, where ever the object there is is always a gravitational force pulling the object down.

Hence there is always acceleration on the object.

Answer 2

From the moment the object is thrown, it is accelerating at 9.8 m/s^2, or the acceleration caused by gravity. Therefore, at its highest point (and every other point in its trajectory) it will have an acceleration of 9.8 m/s^2. Remember that acceleration is change in velocity; the object wouldn't gain downward velocity unless it was accelerating downward.

Answer 3

if we can all agree that at the highest point the velocity is indeed zero, since acceleration is defined as the rate of change of the velocity, if the acceleration at the top was also zero, it would mean the velocity at the top would never change and be zero for ever so the object would just hang there in space without moving. such behaviour is not usually observed.

Answer 4

The acceleration will be 0 at the highest pint and the object will fall freely under gravity .

Answer 5

during flight phase, acceleration will be a sum of the following :
- gravitational force (-9ms^-2 vertical) if you don't throw too hard. if supermanthrew it, it might be different : might excapt earth's gravity field and get in the sun's or somthing like that.
- possible acceleration due to friction forces (if there's wind)
- possible acceleration due to electromagnetic forces forces
- possible buoyancy forces
(the influence of inertia doesn't count, here. It will appear later in the calculations)

during the launch phase, 2 main forces : gravitation and the frictional force that launched the object (or was it electromagnetic)

during the landing phase, frictional force is paramount.

Answer 6

at the highest point of the object velocity would zero.acceleration is rate of change of velocity.so acceleration would be zero.

Answer 7

The velocity would be 0 but the acceleration would be the same always 9.81 m/s^2.

Answer 8

-9.8m/s^2

9.8m/s^2 is the acceleration due to gravity which applies for the whole time the object is in the air, and the minus sign shows that the acceleration is in the opposite direction to when went up.

Answer 9

Zero- for the acceleration upward is offset by the gravitional downward acceleration

Answer 10

Zero at the top. Then the descent will start and the speed picks up as it starts down