· (III) Mary and Sally are in a foot race (Fig. 2–39). When Mary is 22 m from the finish line, she has a speed of 4.0 m/s and is 5.0 m behind Sally, who has a speed of 5.0 m/s. Sally thinks she has an easy win and so, during the remaining portion of the race, decelerates at a constant rate of 0.40 m/s² to the finish line. What constant acceleration does Mary now need during the remaining portion of the race, if she wishes to cross the finish line side-by-side with Sally? Finish Sally Mary „4.0 m/s 5.0 m/s –5.0 m →| | -22 m- FIGURE 2-39 Problem 37.

· (III) Mary and Sally are in a foot race (Fig. 2–39). When Mary is 22 m from the finish line, she has a speed of 4.0 m/s and is 5.0 m behind Sally, who has a speed of 5.0 m/s. Sally thinks she has an easy win and so, during the remaining portion of the race, decelerates at a constant rate of 0.40 m/s² to the finish line. What constant acceleration does Mary now need during the remaining portion of the race, if she wishes to cross the finish line side-by-side with Sally? Finish Sally Mary „4.0 m/s 5.0 m/s –5.0 m →| | -22 m- FIGURE 2-39 Problem 37.

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

See similar textbooks

Similar questions

2) Alice drops a ball from rest from the top of a 4-floor building with height h. How long does it take for the ball to reach the first floor (NOT the ground floor)? What is the speed of the ball when it is in the middle of the building? [Express your results in terms of the g and h]
3. (I) A particle at t₁ = -2.0s is at x₁ = 4.8 cm and at 12 t₂ = 4.5 s is at x2₂ = 8.5 cm. What is its average velocity over this time interval? Can you calculate its average speed from these data? Why or why not?
Q5) A man starts from the origin and walks 20 m along the positive x-axis. He then turns around and moves 12 m along the negative x-axis. If the time of the whole trip is 6 s, then his average speed (in m/s) is A) 5.3 B) 1.3 C) 3.3 D) 0 E) 2.0
(a) Starting at the position x = 0, you walk in the +x-direction for 6 seconds at a constant speed, then stop for 2 seconds, then turn around and walk back toward the origin at a constant speed for 2 seconds, coming to a stop at a position x = 1 m and waiting there for a second. Assume that t= 0 is the initial time. Which of the following best represents the graph of your x-position vs. time t for your motion? n Which of the following best represents the graph of your velocity v, vs. time t for your motion? Vx V₂ OO V₂ H 00 V₂ Ⓡ
9) Generic Villain, in an airplane, is chasing Generic Hero who is driving a car. The speed of the airplane is 147 m/s and the speed of the car is 51.0 m/s. If the Villain, at an altitude of 1.00E2 m, wants to drop a bomb on the Hero (and assuming the airplane is in level flight) how far should they be away from the car when they do so? (If you care, the hero gets away with some generic special effects and, you know, turning...) (434 m)
10) An object has a position given by [2.0 m+ (5.00 m/s)] + [3.0 m - 2.00 m/s2)/2, where quantities 7 are in SI units. What is the speed of the object at time -2.00 s? 10) A) 7.65 m/s B) 7.00 m/s C) 13.0 m/s D) 6.40 m/s E) 9.43 m/s
3. ि Ferrari is one of the fastest hypercars commercially produced, capable of reaching a speed of over 340 km/h. Some time at the race, its velocity is recorded at a whopping 358 km/h. If it accelerates at a constant rate of 7 km/hr², how long would it take to finish the race from the moment its velocity was recorded up to the finish line, which is 4500km long?
Q.1-) A sport car travels in a straight line from the rest (x=0) with an acceleration as given by the acceleration-displacement graph. Determine the sport car's speed when displacement x= 50m, 120 m and 250 m. Acceleration (m/sec²) 5 50 120 250 х (m)
6. (II) A particle at =-2.0s is at x 3.4 cm and at 12 = 4.5 s is at x2 = 8.5 cm. What is its average velocity? Can you calculate its average speed from these data? driving
You are going to your hometown by a bus that is moving with constant speed. During the journey, if you toss a coin, will it fall to the same spot? If no/yes, Explain