Antonina throws a coin straight up from a height of
1
.
2
m
1.2m1, point, 2, space, m above the water surface in a fountain. the coin strikes the water
1
.
3
s
1.3s1, point, 3, space, s later. we want to know the vertical velocity of the coin at the moment it strikes the water. we can ignore air resistance.
which kinematic formula would be most useful to solve for the target unknown?

Awelder using a tank of volume 7.50×10^-2 m^3 fills it with oxygen (with a molar mass of 32.0 g/mol ) at a gauge pressure of 3.30×10^5 pa and temperature of 37.1 ∘c. the tank has a small leak, and in time some of the oxygen leaks out. on a day when the temperature is 23.1 ∘c, the gauge pressure of the oxygen in the tank is 2.00×10^5 pa . a) find the initial mass of oxygen. b) find the mass of oxygen that has leaked out.