a ball is thrown straight upward with a speed of 20 m/s with what speed does the ball hit the ground?

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a ball is thrown straight upward with a speed of 20 m/s with what speed does the ball hit the ground?

Physics
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and i have another one the total time of all remains in the air is 14 seconds. a)with what speed was the ball thrown upwards b)what is the maximum height reached by the ball
I say 20m/s for the first one
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Other answers:

at highest point speed=0m/s v=u+gt 0=20-9.8 t t=20/9.8=2s approx time of flight=2*2=4s
yes you are correct.
what is the 0 in 0=20-9.8 t
speed at highest point.
what about the second question?
ok
forsecond take t=14/2=7 seconds and proceed as i have done.
idk
would the acceleration be + or-
+ right?
0=u-9.8*7 u=?
when going upward g is -ve,when going down g is +ve.
why are you using half the time why not the whole 14 seconds?
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oh so would it be 69 m/s
for a)
oh and is it + or - accelaration?
69 m/s approx or68.6m/s
why is it - acceleration
if its going upwards
\[v^2-u^2=2as\]
because it is retardtion and speed is decreasing.
and for be is it 48x10 m
?
b) 48x10 m?
\[0^2-68.6^2=-2*9.8*h\] \[h=\frac{ 68.6*68.6 }{ 2*9.8 }=7*34.3=240.1m\]
a stone is dropped from 150 meters high .initial velocity is zero. a)with what speed does the stone strike the ground b)how long is the stone in the air c)sketch a position vs time graph for the stone
\[v^2-u^2=2gh\]
This is what I did \[\frac{ 69 m/s +0 m/s}{ 2 }(14 s) =Deltax\]
for the second question part b

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