Please answer Queations 001 and 002 001 is in unit Second 002 is in units km Thi

Question

Please answer Queations 001 and 002

001 is in unit Second

002 is in units km

This print-out should have 10 questions. Multiple-choice questions may continue on the next column or page - find all choices before answering. A plane lands with a velocity of +125.3 m/s and decelerates at a maximum rate of 6.2 m/s^2. From the instant the plane touches the runway. what is the minimum time needed before it can come to rest? Answer in units of s. The plane is landing on a naval aircraft carrier that is 0.80 km long. What distance does the plane require to land? Answer in units of km. A car starts from rest and trawls for 6.5 s with a uniform acceleration of +1.8 m/s^2. The driver then applies the brakes, causing a uniform deceleration of 1.5 m/s^2. If the brakes are applied for 2.1 s. bow fast is the car going at the end of the braking period? Answer in units of m/s. How far has it gone from its start? Answer in units of m. Two students are on a balcony 18.8 m above the street. One student throws a ball vertically downward at 15.2 m/s. At the same instant, the other student throws a boll vertically upward at the same speed. The second ball just misses the balcony on the way down. What is the magnitude of the velocity of the first ball as it strikes the ground? Answer in units of m/s. What is the magnitude of the velocity of the second ball as it strikes the ground? Answer in units of m/s. What is the difference in the time the balls spend in the air? Answer in units of s. How far apart are the balk 0.814 s after they are thrown? Answer in units of m. The plot shows x(t) for a particle. Which statement is correct about the motion? The particle moves along a portion of a circle, as the sketch shows directly. The particle follows the path of a projectile. like a thrown baseball. The particle moves at constant speed, but not at constant velocity. The particle slows down, comes momentarily to a rest, then returns with increasing speed to its starting point. The particle at first speeds up. then slows down, then speeds up again. The graph shows the velocity r as a function of time t for an object moving in a straight line. which graph shows the corresponding displacement x as a function of time t for the

Explanation / Answer

001

ts = (vf – vi)/a

(0 - 125.3)/-6.2 = 20.20 secs

002

(125.3 + 0)/2 x 20.20 = 1265.54m = 1.26 km

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