2. The graph to the right shows the position vs. time graph for two objects (the solid line for object A and the dashed line for object B). a. Do the two objects ever have the same velocity? If so, at what time? How do you know? 8 6 4 2 0 x (m) I A 2 w. 3 1 4 t (s)
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- r (ms) 4. Consider the following v vs. t graph a. What is the acceleration at: i. t= 11 s? ii. t= 15 s? b. How far, and in which direction, did the object travel: i. ii. from t = 13 to t = 18 s? c. During what time intervals is the object speeding up? slowing down? d. During what time intervals is the acceleration positive? Negative? Zero? from t = 4 to t = 11 s? e (sec) ip3. Irina dives from a 25-meter high platform into a water (see diagram ). 25 m a. Irina's acceleration as she is falling from the platform. What hypothesis(s) must you make in order to state this value as the acceleration? Explain. c. Use kinematic equations to fill in the table below. Time (s) Velocity (m/s) Fallen Distance ( m) Height (m) 25 0.5 1.0 1.5 2.01. Consider the following v-t graph. a. At what time(s) is the object moving fastest? What is its speed at that time(s)? b. c. Draw a matching d-t graph. d. How far did the object move during the first 5 seconds? e. How far did the object move during the first 10 seconds? √(5) O 0 IT N + 6 4 1 T 00 O IN 2 IT -lot *LD O • [] 4 20 t(o)
- A bee flies from a petunia to a marigold at an average speed of 3 feet per second. Immediately upon reaching the marigold the bee turns around and flies back to the petunia at an average speed of 6 feet per second, following his original path. What was the bee’s average speed for the round trip? a. 3 feet per second b. 4 feet per second c. 6 feet per second d. 4.5 feet per secondLucas is driving west with belongings on car. After driving west for an hour and a half he stops for gas 110 km from his parents house.As he gets back in car he notices one of the boxes fell off. He gets back in car and heads east for 30 minutes traveling 50 km before he sees box.Determine Luca average speed and velocity for each part of the trip.a. The first hour and a half B. The next 20 minutes. Did he travel faster or slower compared to the 1st hour and half? C. The whole trip1. A ball is thrown upward from the top of a 50 meter high building with an initial speed of 25 m/s.a. How much time does it take to reach the ground?b. What velocity does it have when it reaches the ground?
- 1,21. A motorized toy car moves at a constant velocity of 4 m/s. You start recording its motion at zero time as it passes a point 2 m from the zero-position point. a. Sketch a position vs. time graph for the toy car. Be sure you include appropriate labels and units for each axis. b. How can you find the velocity of the car from the position vs. time graph? c. Write an equation for the graph using the proper variables and units.Driving down the road at a speed of 23.9 m/s, you suddenly notice a fallen tree blocking the road a distance of 82.0 m ahead of you. You step on the brake pedal and decelerate at a constant rate. What must the magnitude of your acceleration be so that you will come to a stop 6.6 m in front of the tree? a. 3.79 m/s^2 b. 3.48 m/s^2 c. 3.22 m/s^2 d. 7.58 m/s^2
- 3. The graph on the left below shows the position of an object vs. time. a. Sketch a graph of velocity vs, time for the same object on a graph similar to the one on the right. 50 10 40 30 Time (s) 20 10 -10 5. 10 15 20 5. 10 15 20 Time (s) b. Using your velocity vs. time graph, calculate the displacement for each 5-second segment. Use your position vs. time graph to check your answers. In 1991, Carl Lewis became the first sprinter to break the 10-second barrier for the 100 m dash, completing the event in 9.86 s. The chart below shows his time for each 10 m interval. 4. position (m)7. A feather is dropped on the moon from a height of 1.40 meters. The acceleration of gravity on the moon is 1.67 m/s?. Determine the time for the feather to fall to the surface of the moon. a. 2.29 s b. 1.29 s. c. 1.29 m d. 0.29 s. a C d6. A train is moving with a constant speed. The train moves 60 meters for every 1.5 seconds that elapses. a. Assume that we get 40 by dividing 60 by 1.5. What is the name that is commonly given to a quantity represented by this number 40? b. To denote the quantity completely, what additional information must be given besides the number 40? c. How would you interpret the number 40 in this instance? Your answer should mention distance and time. d. Use your interpretation (not algebra) to find the distance the train moves in 2.5 seconds.