PHYS 114 Midterm: 114 E1 tut
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[30 points total] this question consists of two independent parts, a and b. A student throws a ball vertically upward from height h with an initial speed v! at instant 1. The ball reaches its highest point at instant 4 and hits the ground at instant 9. The position of the ball at each instant is indicated in the strobe diagram shown at right. (recall that for a strobe diagram, the positions of the ball are shown at instants separated by equal time intervals. ) i. ! Explain how you used the strobe diagram to determine your answer. ii. ! [5 pts] draw a vector indicating the direction of the average acceleration of the ball between instants 1 and 4. If the average acceleration is zero, state so explicitly. Explain how you used the strobe diagram to determine the direction of this vector. Suppose the speed at instant 1 is exactly equal to that at instant 7. a. !
