Physics

Problem

Two planets have the following characteristics: Planet A: mass

2\,M_{E}

, radius

3\,R_{E}

Planet B: mass

0.5\,M_{E}

, radius

0.7\,R_{E}

(where

M_{E}

and

R_{E}

are the mass and radius of Earth). A pebble is dropped from rest from a height of

25\,\text{m}

on the surface of each planet. (i) Calculate the acceleration due to gravity on each planet. (ii) Determine the time taken to reach the ground on each planet. (iii) State on which planet the pebble lands first.

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