Question

what happens to speed of the ball when it is thrown upwards and dropped from a height

Answer 1

When ball is thrown upward with a force , it experiences an opposite force of gravity which slows down the speed of ball moving upward and starts attracting it towards the earth.
When ball is thrown from a height it experiences an external force in same direction . So its speed become faster than that was before.

Answer 2

Answer :

In order for the ball to move upwards its initial velocity must be greater than zero. As the ball rises, its velocity decreases until it reaches its maximum height, where it stops, and then begins to fall. As the ball falls, its speed increases