In a study of the forces involved when motor proteins move subcellular structure

Question

In a study of the forces involved when motor proteins move subcellular structures in cells, Shtridleman et al.* studied the motion of objects in living cells. In this paper, they extracted the position of a vesicle using video. Some of the frames are shown in the figure at the left below and is shon aeanengrecion hey call y) is shown at the right. t = 0s t 2s 6 E4 A t4s t=6s 2 4 t (s) Six instants of time are identfted on the graph at the right and labeled by right and labeled by the le Assuming that a smoothed model of the motion is appropriate for understanding the forces involved, choose the letter for the instant of time that would represent the events labeled in parts 1 through 4 below.

Explanation / Answer

1] The instant of time at the which the vehicle is moving with the highest speed =A

2] The instant of time at the which the vehicle is moving with the lowest speed =F

3] The instant of time at the which the vehicle feels net force of largest magnitude= A

4] The instant of time at the which the vehicle's acceleration is the largest magnitude= A

5] The instantaneous speed at instant D= Y/t=5*10-6 m/5s=1*10-6 m/s

6] The average speed between t=0 and D is ;-

V avg= Total distance/ total time= 5*10-6 m/5s=1*10-6 m/s

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