Obtain the equations of motion for each mass. inthe mechanical system shown in figure p2 6, the spring forces are zero when x2+小ouet the base be stationary so that x3( 0 for ail values of t draw free-body dagams and write a pair of coupled differential equations that govern the motion when the only inout is fat figure p26 a, m, b,

Which explanation describes the forces involved for a person to walk down the sidewalk? a. the person's feet push backward on the sidewalk; the sidewalk pushes backward on the person. b. the person's feet push forward on the sidewalk; the sidewalk does not push on the person. c. the person's feet push backward on the sidewalk; the sidewalk pushes forward on the person. d. the person's feet push forward on the sidewalk; the sidewalk pushes forward on the person.