Question #3e15b

1 Answer
Sep 4, 2016

19.8 = 9.81 t t=2.01 secs

Explanation:

0 - v = g (t-t_0)
where t is the time at which the maximum height is reached, after the stone is thrown upward, at time t_0. The time taken is of course the difference and we get
19.8 = 9.81(t-t_0)
or
t = 2.01 secs, as we are free to set t_0 = 0 secs. Maximum height is the point where the height ceases to increase, and therefore the vertical velocity is 0 m/s.