Question

Question #3e15b

Answer 1

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.