Question

Question #6f91b

Answer 1

I found the following values (in red in the explanation):
(but check carefully my math!!!)

Explanation:

Have a look:

Answer 2

Have a look if it is clearer.

Explanation:

Using the same diagram.
Considering that:
`v_i=7.25 m/s`
`h_1+h_2=25m`
Use: `v_f-v_i=at`
`0=7.25-9.81t_1`
`t_1=0.74s`
Use:
`h_1=v_it_1+1/2at_1^2`
`h_1=7.25*0.74-1/289.81(0.74)^2`
`h_1=2.68m=2.7m`

`h_2=25-2.7=22.3m`
`h=h_2-h_1=19.6m`
to fall down:
`-h_2=-1/2*9.81t_2^2`
`t_2=2.13s`
into `v_f-v_i=at`:
with `v_i=0`
`v_f=21m/s`
and
`T_(comp.te)=t_1+t_2=2.87s`