NEED HELP ASAP PLEASE HELPP

Several students in the group made comments to the coach about the back pack. which student has the correct analysis of the forces and motion of the back pack?

Amplitude is a measure of a waves a; speed b; distance c; energy d; frequency

Asubmarine has a "crush depth" (that is, the depth at which water pressure will crush the submarine) of 250 m. what is the approximate pressure (water plus atmospheric) at this depth? (recall that the density of seawater is 1025 kg/m3, g = 9.81 m/s2, and 1 kg/(ms2) = 1 pa = 9.8692 10-6 atm.) a. 34.8 atm b. 24.8 atm c. 25.8 atm d. 7.8 atm