#4
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find gravitational potential energy!
you!

Explanation:

Gravitational Potential Energy

It's the capacity of an object to do work due to its relative height from a fixed reference point.

It's computed as

GPE=m.g.h

Where m is the mass of the object, h is its height and g is the acceleration of gravity,

The mass of water is given as

The height above the rocks is h=50 m. Let's compute the GPE

It should be expressed in scientific notation

The GPE at the bottom, where h=0

The change of gravitational potential energy is:

it's a b and

answer( sicar );