Question

What is the value of g at the centre of the earth If An object takes 5 s to reach the ground from a height of 5 m on a planet (not earth). What is the value of g on the planet.​ (3 Mark's)

Answer 1

Answer:

The gravitational acceleration of the planet is 0.4 m/s2.

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Answer 2

Answer:

0 at centre of earth.

Explanation:

As you go in depth, the mass of earth would not act completely. So it would reduce. If you go to centre, mass acting of would become 0.

Consider g on the planet as acceleration. Let it be g. We know
initial velocity u = 0m/s
distance          s = 5m
time taken       t = 5sec

By s=ut+1/2at*t, 5 = 1/2 * g * 5 * 5

So, 5 = 25g/2, 25g = 10 , g = 10/25 = 2/5 = 0.4m/s^2

Hence, 0.4m/s^2 is the acceleration