Which statement best describes why a machine is useful?

a-a machine does a greater amount of work than the amount of work that is done on it.
b-a machine does a smaller amount of work than the amount of work that is done on it.
c-a machine can decrease both the input force and the input distance needed to do a given amount of work.
d-a machine can decrease either the input force or the input distance needed to do a given amount of work.

Answer;

D-A machine can decrease either the input force or the input distance needed to do a given amount of work.

Explanation;Machines or simple machines are devices that make work easier by reducing, multiplying, or changing the direction of a force. These machines includes; lever, inclined plane, pulleys, wheel and axle, etc.Machines can reduce either the input force or the input distance needed to do a given amount of work. Additionally, machines can not change the amount of work being done, but, they reduce the effort force which is required for work to be done.

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