Net Work & Kinetic Energy Video Lessons

Concept

# Problem: Use the work-energy theorem to solve each of these problems. You can use Newtons laws to check your answers. Neglect air resistance in all cases.A branch falls from the top of a 95.7-m-tall redwood tree, starting from rest. How fast is it moving when it reaches the ground?A volcano ejects a boulder directly upward 526 m into the air. How fast was the boulder moving just as it left the volcano?

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###### Problem Details

Use the work-energy theorem to solve each of these problems. You can use Newtons laws to check your answers. Neglect air resistance in all cases.

A branch falls from the top of a 95.7-m-tall redwood tree, starting from rest. How fast is it moving when it reaches the ground?

A volcano ejects a boulder directly upward 526 m into the air. How fast was the boulder moving just as it left the volcano?

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