1. The problem statement, all variables and given/known data A model rocket blasts off from the ground, rising straight upward with a constant acceleration that has a magnitude of 76.0 m/s2 for 1.54 seconds, at which point its fuel abruptly runs out. Air resistance has no effect on its flight. What maximum altitude (above the ground) will the rocket reach? Segment 1 Known Values: Vo1 = 0 m/s a1 = 76.0 m/s2 t1 = 1.54 s Unknown Values: Vf1 = x1 = Segment 2 Known Values: a2 = -9.80 m/s2 Unknown Values: Vo2 = Vf1 = Vf2 = t2 = x2 = 2. Relevant equations Eq 1: Vf = Vo + at Eq 2: x = Vot + 1/2 at2 3. The attempt at a solution I broke the question up into two segments. It was pretty easy to find the unknowns in the first segment. Using Eq 1, I found Vf1 to be 117 m/s Using Eq 2, I found x1 to be 90.1 m Vf1 will be = to Vo1. But I'm left finding Vf2, t2 and x2. I'm stuck because to find x2 I need t2...but to find t2, I'm pretty sure I need x2. And naturally Vf2 would be helpful as well... a = [tex]\Delta[/tex]v / [tex]\Delta[/tex]t But I don't have t or Vf so I don't think I can use that here... Any suggestions?