Question

When a ball is thrown upward, what are its velocity and acceleration at its highest point?

Answer 1

v=0 a=-9.8m/s^2

Answer 2

When the ball reaches the highest point it's velocity is zero, because the ball has to stop and begin to fall back.

Likewise it's acceleration is zero because acceleration is velocity / time, and at that instant the ball stops to begin it's reverse, the velocity is zero and the time is 0. So zero velocity / zero time = zero acceleration

Answer 3

For projectile trajectories, acceleration is always g (\(9.81~ m/s^2\)), the acceleration of gravity, regardless of speed. When something is not moving, its velocity is zero.

Answer 4

as the ball goes up its velocity decreases when it reaches its highest point the velocity is 0 and as it comes back down the velocity increases. the acceleration is 9.8