Question

Suppose a ball is tossed vertically. At the top of its trajectory:

a. Its acceleration is zero
b. Its acceleration is nonzero and toward the ground
c. Its acceleration is nonzero and upward

Question 3. Suppose a ball is tossed vertically. At the top of its trajectory:

a. The net external force on the ball is zero
b. The acceleration of the ball is zero
c. The velocity of the ball is zero

Answer 1

I got the answer for question 3, is C as the ball stops(v=0) and starts falling from the top of the trajectory. The first one is kinda tricky, let me check the first one out.