Question

an object takes 5 second to reach the Ground from a height of 5 M on a planet what is the value of g on the planet

Answer 1

taking initial velocity 0 m/s
as we know s=ut +at/2
5=g5/2
g=2m/s^2
done
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Answer 2

The value of g on the planet are as follows;

s= ut + 1 / 2at²

5 = 0 + g*25/2

5=  0+25g/2

10= 25g

g= 10/25

g= 0.4 m/s2