# Why does a basketball have positive acceleration when thrown?

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If you throw the ball upward with a speed of 9.8 m/s, the velocity has a magnitude of 9.8 m/s in the upward direction. … The ball has zero velocity, but the acceleration due to gravity accelerates the ball downward at a rate of –9.8 m/s2. As the ball falls, it gathers speed before you catch it.

## Does a basketball have a positive or negative acceleration when thrown?

It’s acceleration is also zero. The direction of a ball’s motion is changing as it rises into the air when thrown. The speed of the ball decreases because gravity pulls it towards the ground and makes the distance it can cover in one second decrease.

## Is acceleration positive when thrown up?

If something is accelerating upwards it has dv>0 and therefore a positive acceleration. Likewise something accelerating downwards has a negative acceleration. In your question you’ve used the usual convention that distances up are positive, so the initial velocity of +20 m/s means the object is moving upwards.

## When a ball is thrown and moving upward is its acceleration positive negative or zero?

The direction of the ball’s motion is upward, and doesn’t change. The speed of the ball will decrease as it goes higher. At the top of the motion, the speed is zero. It’s acceleration is also zero.

## What happens when acceleration is zero?

If there is no acceleration, then the object will move with a constant velocity. Mathematically, we can look at Newton’s second law and the formula for acceleration. … Since we know that the mass cannot be zero, the acceleration must be zero.

## Does a positive acceleration always mean an increase in speed?

If the speed is increasing, the car has positive acceleration. When the car slows down, the speed decreases. The decreasing speed is called negative acceleration. In both cases, the car is accelerating, but one acceleration is positive and one is negative.

## At what point during its motion is the object’s acceleration zero?

When acceleration is zero (that is, a = dv/dt = 0), rate of change of velocity is zero. That is, acceleration is zero when the velocity of the object is constant.

## What is the acceleration at the highest point?

At a projectile’s highest point, its acceleration is zero.

## Can an object’s speed increase if its acceleration decreases?

Yes. An object will be increasing in speed so long as it’s acceleration is positive. Since it is possible for an acceleration to be both positive and decreasing, it is possible that an object can be both increasing in speed and decreasing in acceleration.

## How do you find free fall acceleration?

acceleration, a=g. Freefall is the autonomous phenomena of the body with some mass. It only depends on height from the surface and the time period for which the body is flung. 