How does lenses contribute to the innovative solutions to solve some problems in this generation

Tall pacific coast redwood trees can reach heights of about 100 m. if air drag is negligibly small, how fast is a sequola cone moving when it reaches the ground f it dropped from the top of a 100 m tree?

In the first law of thermodynamics, triangle e=q-w, what does q stand for

This is the number of complete movements of a wave per second.