Question

an object takes 5 seconds to reach the Ground from a height of 5m on the planet what is the value of g on the planet
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Answer 1

=ut + 1/2 * (at^2)

u=0

so

5 = (a*5*5)/2

So

a= 10/25

a= 0.4 m/s^2.

Answer 2

We know that
s=ut+1/2(a×t^2)
here u=0.
t=5sec and
s=5m
5=0+(a×5×5)÷2
=> 10=25a
=> a= 0.4
hence acceleration,or g = o.4 m/s^2.