Velocity graph of a particle moving along the x-axis. its initial position is x0 =2m at t0 = 0. at t = 3 s , what are the particle's (a) position, (b) velocity, and (c) acceleration?

Amichelson interferometer operating at a 600 nm wavelength has a 3.02-cm-long glass cell in one arm. to begin, the air is pumped out of the cell and mirror m2 is adjusted to produce a bright spot at the center of the interference pattern. then a valve is opened and air is slowly admitted into the cell. the index of refraction of air at 1.00 atm pressure is 1.00028.how many bright-dark-bright fringe shifts are observed as the cell fills with air?