A car travels along a straight road (in the +x direction). The position of the c

Question

A car travels along a straight road (in the +x direction). The position of the car as a function of time is shown in the figure below. When the car changes speed, it does so uniformly, with arrows indicating the times when the push on the brakes or accelerator changes. Read it to me 70 - 0123 456 7 89 10 11 12 13 14 15 16 17 18 A. For each statement below, select the appropriate choice for the value of ax, the x Read it to me -component of the acceleration M and L, ax is zero: Between L and R, a, is zero: After N, a is S and T, ax is B. Evalu onent of the acceleration between M and L. is a v of the ents of velocity. Positive a, corresponds to increasing speed in the di of the Tries 3/30 Previous Tries a, d, 11/10/2017

Explanation / Answer

vM = 50 / 5.5 m/s

vL = (-50 - 47) / 7 = - 97/7

{ velocity is the slope of x vs t curve}

acceleration = rate of change in velocity

= (vf - vi) / t

= (- 97/7 - 50/5.5) / 1.5

= - 15 m/s^2

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