Zach, whose mass is 80 kg, is in an elevator descending at 10 m/s. The elevator takes 3.0 s to brake to a stop at the first floor. (a) What is Zach's weight before the elevator starts braking?

(II) A rocket with a mass of 2.45 x 10⁶ kg is launched by exerting a vertical force of 3.55 x 10⁷ N on the gases it expels. Determine

(a) the acceleration of the rocket, Assume g remains constant, and ignore the mass of gas expelled (not realistic).

(II) A woman stands on a bathroom scale in a motionless elevator. When the elevator begins to move, the scale briefly reads only 0.75 of her regular weight. Calculate the acceleration of the elevator, and find the direction of acceleration.

(II) What will a spring scale read for the weight of a 58.0‑kg woman in an elevator that moves

(a) upward with constant speed 4.4 m/s,