Find the efficiency of a machine that does 800 J of work if the
input work is 2,000 J.

Efficiency: 0.4 (40%)

Explanation:

The efficiency of a simple machine is given by the ratio

where

is the input work of the machine

is the output work of the machine

For the machine in this problem, we have:

is the output work

is the input work

Therefore, the efficiency of the machine is

Which can be also written as percentage:

false

explanation:

boats, things on boats luggage are way more heavy then water.

c. newton's third law of motion