apply the formula for Max height H = u^2/2g
where u is intial speed = 20 m/s
g is accletation due to gravity
so
H = (20*20)/(2*9.8)
H = 20.40 m -----------------<<<<<<<<<<<<<<<<Answer
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apply time period of flgiht
t = 2u/g
t = (2*20)/9.8
t = 4.08 secs-----------------<<<<<<<<<<<<<Answer
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