Questions 7-9 refer to the following material. A bus and a truck are initially a
ID: 1624259 • Letter: Q
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Questions 7-9 refer to the following material. A bus and a truck are initially at rest alongside each other at a traffic light. When the light turns green at time t = 0, the two vehicles proceed in the same direction along a straight road as shown in the graphs above of speed v as a function of time. Which of the following best describes the acceleration of each vehicle before it reaches constant speed? (A) Constant Increasing (B) Constant Decreasing (C) Increasing Constant (D) Decreasing Constant Which of the vehicles has traveled the farthest distance at t = 12 s, and what information from the graph supports that conclusion? (A) The truck, because it has a greater speed at t = 12 s (B) The truck, because the slope of its graph is positive for a longer time (C) The bus, because the area under its graph is greater (D) The bus. because the slope of its graph is greater for the interval from t = 0 to t = 4 s During the time interval between t = 0 s and t = 4 s, how does the average net force exerted on the bus compare to the average net force exerted on the truck? (A) It is greater. (B) It is the same. (C) It is less. (D) It cannot be determined without knowing the masses of the vehicles.Explanation / Answer
7 Bus and truck both acceleration increasing because final velocity is greater than initial
8 A, because truck has higher speed at t=12s
9 D because force is ma ,a of truck is greater than bus but mass we do not know
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