A plane that is moving 200m/s drops a package. The package takes 15 seconds to reach the ground. A.) What height was the package dropped from?

B.) How far did the plane travel from the time the package was released until the package hit the ground? Is this the same distance the package travels?

C.) How fast was the package moving when it hit the ground?

Uranium has two naturally occurring isotopes. 238u has a natural abundance of 99.3% and 235u has an abundance of 0.7%. it is the rarer 235u that is needed for nuclear reactors. the isotopes are separated by forming uranium hexafluoride uf6, which is a gas, then allowing it to diffuse through a series of porous membranes. 235uf6 has a slightly larger rms speed than 238uf6 and diffuses slightly faster. many repetitions of this procedure gradually separate the two isotopes. what is the ratio of the rms speed of 235uf6 to that of 238uf6? express your answer to five significant figures.