The height & speed are mathematically given as
t = 0.2 s
u = 4 m/s
What is the height & speed?
Generally, the equation for height is  mathematically given as
h = 0.2gt^2
Therefore
0.2 = 0.5 * 9.8 *[tex]t^2[/tex]
0.2 = 4.9 *[tex]t^2[/tex]
t = 0.2 s
b)
In conclusion, the initial speed is
s = ut
Therefore
u = 0.8 / 0.2
u = 4 m/s
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