From what maximum height could a 75 kg person jump and land rigidly upright on both feet without breaking their legs

Aball tossed vertically upward from the ground next to a building passes the bottom of a window 1.8 s after being tossed and passes the top of the window 0.20 s later. the window is 2.0 m high from top to bottom. what was the ball's initial velocity? the unit vector j^ is directed upward. how far is the bottom of the window from the launch position? how high does the ball rise above the launch position?

The electronic structure or chlorine is 2.8.7 what is the electronic structure of fluorine?

What is the major limitation to the light microscope?