Question

8. A tennis player moves in a straight-line path as shown in Figure P2.8. Find her average velocity in the time inter- vals from (a) O to 1.0 s, (b) O to 4.0 s. (c) 1.0 s to 5.0 s, and (d) 0 to 5.0 s. -I(S) $ FIGURE P2.8 (Problems 8 and 9) 9. Find the instantaneous velocities of the tennis player of Figure P2.8 at (a) 0.50 s, (b) 2.0 s. (c) 3.0 s, and (d) 4.5 s.

Answer 1

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Answers 8 Given that A tennis played moves in a straight line given in the figure. path as in average velocity the time o we have to find her intervals from (a) o to los let, The allerage velocity is defined as time rate of displacement. llarg = A Where, an is the change in displacement at is the time interval let the tennis player is displaced from the position xito af in time from ti tots intertal NOW, The average velocity of the playeris: llarg = re at Substitie. ef=hrom tf = los ,x;=ooom rtis duos

(h.om)-lorom) (los)-(0.03) ū= nomls Therefore, The average lielocity in the time interval os to loos is į homls] (6) o to hos Varg = 2 8 - 2 1 va ? Xf-li tf-ti Here, ac = -2.0m iff-hos *1 = oom , ti-005 ū.1-2.0-0.0lm Thos) - (0-03) ūs the one üsimis T = 20:5w/5) Therefore, The allerage lelocity in is the time intelllal os to hos -0.5m/s

loos to 5.os Vaug = Xf-li toti Whele, Mf coom , t = 5-os Xi = Hom ti-los (boom) - Coium) (505) - 11.os) . Therefore, L = -0.14/3) The average velocity velocity in the time internal los tosios is Loints) allerage (d) o to 5.05 ngoni Vaug = tc-ti Linese, ef=o.om di coom , t=5.05 , tiroom T: (o.com) - Loone) R 150s)-10-08) ūro Therefore, The average lielocity in the time interval oto 5.o. is loouls]