LEARN MORE REMARKS To find the displacement while braking, we could have used the two kinematics equations involving time, namely, Ax = vit + _ at2 and v = v + at,but because we weren't interested in time, the 2 time-independent equation was easier to use. QUESTION By how much would the answer change if the plane coasted for 2.0 s before the pilot applied the brakes? X Your answer cannot be understood or graded. More Information m PRACTICE IT Use the worked example above to help you solve this problem. A typical jetliner lands at a speed of 151 mi/h and decelerates at the rate of (10.3 mi/h)/s. If the jetliner travels at a constant speed of 151 mi/h for 1.2 s after landing before applying the brakes, what is the total displacement of the jetliner between touchdown on the runway and coming to rest? m EXERCISE HINTS: GETTING STARTED | I'M STUCK! A jet lands at 29.5 m/s, the pilot applying the brakes 2.32 s after landing. Find the acceleration needed to stop the jet within 5.30 x 102 m after touchdown. m/s2 Need Help? Read It