An object of mass m is dropped from height h above a planet of mass m and radius r. find an expression for the object’s speed as it hits the ground.

Explanation:

Given

mass of object is m

Mass of planet is M

radius of planet is R

Total Energy associated with mass m at a height h above planet is Gravitational Potential Energy which is given by

When it falls on earth with some velocity v

=Kinetic Energy+Potential Energy

As Energy is conserved therefore

28. evolution

29. environment, survive, offspring  

explanation:

i would say the answer is food.

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