Question

a cannon fires a cannon ball straight up with an initial velocity of 25.4 m/s . How long will the cannonball be in the air before it hits the ground?

Answer 1

The time the ball takes to fall from its max height is equal to the time it takes to reach its max height. Therefore, all you need to do is to find the time it takes to reach its max height, then multiply it by 2.

Answer 2

When the ball reaches its max height, the velocity is 0.

Answer 3

Apply the formula \(v_f=v_i+at\). In this case, \(a=-g\).