please help ASAP. It's important. There are 3 questions, if you can help with any of them, that would be great. Thanks!

According to social exchange theory, altruistic behaviors benefit the individual who performs them.

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?

Which is not true about oxygen-17 and oxygen-18?