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72% Sat Jun 11 11 01 08 AM Q :E Chrome File Edit View History Bookmarks People Window Help Josh Motion in one dimension C Chegg Study I Guided Soll www.webassign.net /web/Student/Assignment-Responses/last?dep 13907357 App Bookmarks Apple YouTube home Watch Live Sports E O tech Destiny LFG.Net l The faculty.pnc.edu/ptes DTR Destiny Tracker De Eii C. Henry Edwards, Section 2.3 3. CO-2 points CJ10 2.P018 My Notes Ask Your Teacher A sprinter explodes out of the starting block with an acceleration of +4.2 m/s2, which she sustains for 1.4 s. Then, her acceleration drops to zero for the rest of the race. (a) What is her velocity at t 1.4 s m/s (b) What is her velocity at the end of the race? m/s Additional Materials L Section 2.3 Submit Assignment Save Assignment Progress Home My Assignments Extension Request WebAssign® 4.0 97-2016 Advanced Instructional Systems, Inc. All rights reserved.

Explanation / Answer

acceleration a = 4.2 m/s2  

t = 1.4 sec

a )

her velocity at t = 1.4 sec

v = a t

v = 4.2 X 1.4

v = 5.88 m/s

b )

after 1.4 sec acceleration stops and maintain constant velocity

so the velocity at the end of the race is 5.88 m/s

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