Question 2.6: RUNWAY LENGTH GOAL Apply kinematics to horizontal motion wit...
RUNWAY LENGTH
GOAL Apply kinematics to horizontal motion with two phases.
PROBLEM A typical jetliner lands at a speed of 1.60 \times 10^{2} \mathrm{mi} / \mathrm{h} and decelerates at the rate of (10.0 \mathrm{mi} / \mathrm{h}) / \mathrm{s}. If the plane travels at a constant speed of 1.60 \times 10^{2} \mathrm{mi} / \mathrm{h} for 1.00 \mathrm{~s} after landing before applying the brakes, what is the total displacement of the aircraft between touchdown on the runway and coming to rest?
STRATEGY See Figure 2.18. First, convert all quantities to SI units. The problem must be solved in two parts, or phases, corresponding to the initial coast after touchdown, followed by braking. Using the kinematic equations, find the displacement during each part and add the two displacements.
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