Calculate the work done to stretch an elastic string by 40cm if a force of 10n produces an extension of 4cm in it?

What are chlorofluorocarbons and what impact do they have on the atmosphere?

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?

Gordon is going for a run through the park, but it is cold outside. the low outside temperature could affect his personal safety.