Question 1090436
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All we need to know is the time for which the ball thrown vertically up reaches its maximum height of 5 m.


If you ask a physicist, he immediately will answer you: the same time which is needed for freely falling ball 
to fall down 5 m, and will write an equation for it:

{{{(gt^2)/2}}} = 5.     (1)


For this problem, the physicist will take the gravity acceleration g equal to 10 m/s^2 (instead of the more precise 
value of 9.81 m/s^2), and then the equation (1) becomes

{{{(10^t^2)/2}}} = 5,   or

{{{t^2}}} = {{{(5*2)/10}}} = 1,


which implies t = 1 second for time.


So, the time interval between two successions is 1 seconds, and the number of balls thrown per minute is 60.


<U>Answer</U>.   The time interval between two successions is 1 seconds, and the number of balls thrown per minute is 60.
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Solved.