Jaquelin lifts a 350 N backpack a distance of 1.5 m and then carries it forward for 6.5 m. a. How much work did she do lifting the backpack?
b. How much work did she do carrying the backpack?

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?

An isotope undergoes radioactive decay by emitting radiation that has a –1 charge. what other characteristic does the radiation have?

Ihave a density of 1.61g/cm^3 and a mass of 28g. find the missing value