Two planets have the following characteristics: Planet A: mass

PHYSICS · Subjective · AP · Physics 1: Algebra-based · Force and Translational Dynamics · Force and Translational Dynamics

Problem

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.

Related theory

Free-Fall & Vertical Motion
Gravitation
Variation of g
Gravitational Field & Acceleration
Acceleration due to gravity at Earth's surface

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