If a stone with an original volcity of 0 is falling from the ledge and takes 8 seconds to hit the ground what is the final volcity of the stone

Astone dropped into a well is heard to strike the water after 8seconds. find the depth of the well if the velocity of sound is 350m/s

Achlorine atom has 17 protons and 18 neutrons. what is its mass number? what is its atomic number?

Charge is distributed along the entire x-axis with uniform density λ. how much work does the electric field of this charge distribution do on an electron that moves along the y-axis from y = a to y = b? (use the following as necessary: a, b, ε0, λ, and q for the charge on an electron.)