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# Energy of Rock

APPH12-79AJWO

A rock of mass $m$ is thrown from the edge of a cliff at a speed $v$. The cliff is a height $h$ above the ground below.

Neglecting the effect of air resistance, which of the following is a correct expression for the total mechanical energy of the rock as it travels through the air?

A

$mgh$

B

$\cfrac { 1 }{ 2 } m{ v }^{ 2 }+mgh$

C

$\cfrac { 1 }{ 2 } m{ v }^{ 2 }$

D

The total mechanical energy depends on the direction in which the rock was thrown.