Unformatted text preview: Math 21A: Quiz 3
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Name. WOKQ’VICWS Score. 110 Graded. l A This is a closed book, no calculator quiz. The ﬁgure below shows the velocity v = ds/dt = f (t) of a particle moving on a coordinate line. 1. (4 points) When does the particle reverse direction? 1 paws “,ka t: Z t 2* 6/ ,1 pdwﬁkﬁ 3R t710 (\3 ¥VL&CAK(€.(Q 2. (4 points) When is the particle moving at a constant speed? M“ "\ Ame, \WU‘: *~e vva \ C 3,. 5 ) "Z (WWW £0“ \‘AJCWV‘A “ML “A (0'1“?
3. (4 points) When is the particle not moving for an instant or more? f
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4. (8 points) Graph the acceleration, where deﬁned. A a" (‘20 r ‘2 X'h‘k pa “*3 551%“
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 Spring '07
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