A spacecraft descends vertically near the surface of Planet X. An upward thrust of 26.0 from its engines slows it down at a rate of 1.20, but if an upward thrust of only 14.5 is applied, it speeds up at a rate of 0.80. Apply Newton's second law to each case, slowing down or speeding up, and use this to find the spacecraft's weight near the surface of Planet X.