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a. An object takes 5 s to reach the ground from a height of 5 m on a planet. What is the value of g on the planet?

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Given : Time= 5s , Height=5m

To find : Gravitational acceleration

Formula: $$S=ut+\tfrac{1}{2}gt^2$$

steps:

by formula

$$5=0\times t+\tfrac{1}{2}g(5)^2$$

$$5=\tfrac{1}{2}g\times25$$

$$\therefore g=\tfrac{2}{5}$$

$$\therefore g=0.4 m/s^2$$

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