Question

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Puntos:2 A car travels a certain distance along a straight road (in the +x direction). The distance the car travels as a function of time is shown in the figure below. When the car changes speéd it does so uniformly. Select the appropriate choice for each statement 1000 트 800 600 400 200 20 40 60 80 Time (s) Greater than At 79 sec, the speed is as high as it gets nThe acceleration magnitude at 37 sec is the acceleration magnitude at 15 sec. Faise The x-acceleration is. zero at 26 sec Greatethn The speed at 10 sec is the speed at 79 sec. Greater than The speed is. zero at 20 sec. Equal to Less thanThe x-acceleration is... zero at 15 sec changing. This, with the change in speed, shõuld let you estimate the magnitude of the acceleration Using the graph above, calculate the average speed of the car for the period from 0 to 20.0 s By extrapolating the straight sections of the graph, you can estimate the time during which the speed is Enver RespuestaIncorrecto. Tries 7/10 Intentos Anteriores 1.50x10 m/s

Answer 1

Answer :

A) At 79 sec, the speed is as high as it gets...FALSE. {This is the not steepest part of the curve which means you will not get the furthest distance for a given amount of time}

B) The acceleration magnitude at 37 sec is ..Greater than... the acceleration magnitude at 15 sec.{ At fifteen seconds the car is slowing down which implies a negative acceleration. At 37 seconds the car is speeding up which implies a positive acceleration. Positive numbers are bigger than negative numbers}

C) The x-acceleration is ...Greater than.. zero at 26 sec .{ The car is picking up speed from zero speed to something higher. "Picking up speed" is the same as accelerating}.

D) The speed at 10 sec is ...Greater than.. the speed at 79 sec. {The curve is rising at a much faster rate at 10 seconds compared to 79 seconds}

E) The speed is ..Equal to... zero at 20 sec. {The car is not advancing in distance with time, so the speed is zero}

F) The x-acceleration is ..Equal to... zero at 15 sec .{ The speed at ten seconds is constant since the curve is a straight line. So if speed is constant, then acceleration is zero because you are not speeding up or slowing down. NOTE acceleration is equal to zero, speed is NOT equal to zero}.