Answer:
t = 0.306 s
Step-by-step explanation:
Given that,
Initial velocity of the ball, u = 3 m/s
When it reaches the top of its path, its final velocity, v = 0
We need to find the time it takes the ball to reach the top of its path. It can be calculated using first equation of motion.
v = u +at
Here, a = -g

So, the ball will take 0.306 s to reach the top of its path.