What kind of friction exists between solid objects moving in water?

In a system, when potential energy decreases, then entropy also decreases. true false

The difference between a red shift and a blue shift has to do with wavelength frequency. t or f

Amass weighing 24 pounds, attached to the end of a spring, stretches it 4 inches. initially, the mass is released from rest from a point 8 inches below the equilibrium position. find the equation of motion. (use g = 32 ft/s2 for the acceleration due to gravity.)