Date Your Name The velocity vs, time chart at the right plots the velocity of a

Question

Date Your Name The velocity vs, time chart at the right plots the velocity of a moving object as it changes with 6 time. How far away is the object from it's starting point after 30 seconds? (Recall: x vt. Read the chart carefully!) a. x-30 m 6. 0 c.x-90 m d. x 150m 0 5 10 15 20 25 30 time (s) An object is launched (thrown, tossed, shot, whatever) into a parabolic trajectory similar to the figure shown at the right. The object begins at Point #1 and proceeds to its final position at Point #5 Assume no air friction. Also, assume "" is the speed of the object at Point #N. Refer to this picture for the next few questions. 7. Which of the following is true? 8. Which of the following sets of velocity vectors represents the velocity vectors for the object at each point in the trajectory? a. b. c. d. e.

Explanation / Answer

6. Displacement = Area under positive v-t curve -area under negative v-t curve

= 0.5*( 15+5)*9- 0.5*(15+5)*6

= 30 m

7. Horizontal velocity at every instant of the flight is constant, and vertical velocity is highest at 1 and minimum at 3.

Hence option(a) is correct.

8. As the horizontal component of velocity is same for every point so option (b) is correct.

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Comment in case any doubt..goodluck

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