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<h3><u>Answer;</u></h3>
= 75 %
<h3><u>Explanation</u>;</h3>
To measure efficiency of a machine, compare the work output to work input.
Efficiency = Work output/ work output × 100 %
= 300/400 × 100
= 75 %
Work done by each is the same for they reach the same height. The one who climbs in 30s uses more power because work is done in a shorter time.
When the earth is directly between the Moon and the Sun, a Neap tide will happen along a shoreline that is facing the Sun.
In Neap tide moon is at closest distance to earth. The movement of moon cause sea storm/ tides by turbulence of waves.