1. A 747 jumbo jet of mass 30,000 kg experiences a 30,000-N thrust for each of four engines during takeoff. Show that its acceleration is 4 m/s 2 . 2. Suppose the jumbo jet in Exercise 48 flies...

1. A 747 jumbo jet of mass 30,000 kg experiences a 30,000-N thrust for each of four engines during takeoff. Show that its acceleration is 4 m/s².

2. Suppose the jumbo jet in Exercise 48 flies against an air resistance of 90,000 N while the thrust of all four engines is 100,000 N. Show that its acceleration will be about 0.3 m/s². What will the acceleration be when the air resistance builds up to 100,000 N?