A ball is thrown straight up. What is its velocity and acceleration at the top?

Hi,

When a body is thrown upward its velocity keeps on decreasing because of the deceleration due to acceleration due to gravity (g) which pulls the body in downward direction.  At the maximum height velocity becomes zero. Therefore, velocity at the top is zero and acceleration is acceleration due to gravity (g).

Hence we conclude that, at the top

1.  Velocity = 0

2.  Acceleration = g

Hope this helps,

Good luck.