3) While Alison and Emma were playing Frisbee, Emma jumped vertically to a maximum height upward 0.8 m from the ground to catch the Frisbee. a) What was Emma's speed just as she left the ground? b) If it took Emma 0.250 second to jump (Hint: Emma was pressing down on the ground for 0.250 second just before her feet come off the ground), calculate her acceleration (assume that her acceleration was constant) during this 0.250 second. 4) A teacher shoots up a model rocket from rest at ground level. The rocket accelerates upward at a constant rate of 3.00 mfs2 for 11.0 seconds, at which time, the rocket runs out of fuel and gravity determines the rest of its ight. (You may assume that the rocket moves straight up and down during its entire ight.) a) Find the maximum height that the rocket reached. b) How much time did it take the rocket to reach its maximum height