9) When launched the space shuttle could accelerate from rest to 7,950 m/s. a) If the space shuttle has a mass of 2.04 x 106 kg, what impulse is needed to get the shuttle into orbit? b) If the main engines fire for 8 minutes and 15 seconds, what is the average force supplied by the engines? 10) The back tables in our room have a height of around 70 cm. A 65 kg person jumping from such a height lands with a velocity of about 3.7 m/s. The person comes to a rest in 2.0 ms if he stiff-legs the landing and 0.10 s if he bends his knees during the landing. a) What magnitude of impulse will be needed to stop a 65 kg person who jumps from one of our tables? b) In a stiff-legged landing, this person comes to a halt in about 2.0 ms. What is the average force that acts on him during this time? (Hint: 1 ms= 1 x 10 s) c) When he bends his knees, he comes to a halt in 0.10 s. What is the average force that acts on him during this time? d) Calculate the person's weight and compare these forces to his weight: