A ball is thrown downward with an initial speed if 20 m/s on earth.
What is the acceleration of the ball?
vf=a (change in time)t + vi
The Attempt at a Solution
well you have to find the velocity of then find acceleration. and acceleration is m/s^2
on my notes it says that the horizontal acceleration is 0 m/s/s since its being thrown downward, (in a horizontal direction) that's what is getting me confused.