VA Assignment 2: one-Dime x C Chegg Study I Guided Sc x C Physics q Chegg x C ww

Question

VA Assignment 2: one-Dime x C Chegg Study I Guided Sc x C Physics q Chegg x C www.webassign ne 15467737 t/web/Student/Assignment-Responses/submit?dep A race car moves such that its position fits the relationship x 4.5 m/s)t (0.85 m/ where x is measured in meters and t in seconds. (a) A plot of the car's position versus time is which of the following? x (m) 93 25 50 15 t (s) 1.00 2.00 3.00 4,00 5,00 6.00 (m) x (m) 26 220 24 203H 220 20 80 16 40 100 12 00 60 60 20 20 t (s) 1.00 2.00 3.00 4.00 5.00 6,00 t (s 00 2.00 3.00 4.00 5.00 6.00 t (s) 00 2.00 3,00 00 5,00 6.00 :42 AM /21/2017

Explanation / Answer

b) delta t = 0.40 s

=> instantaneous velocity =   4.5 + 0.85 * 3t2

                                            = 4.5 + 0.85 * 3 * 4.92

                                                               = 65.72 m/s

delta t = 0.20 s

=> instantaneous velocity =   4.5 + 0.85 * 3t2

                                            = 4.5 + 0.85 * 3 * 4.72

                                                               = 60.83 m/s

delta t = 0.10 s

=> instantaneous velocity =   4.5 + 0.85 * 3t2

                                            = 4.5 + 0.85 * 3 * 4.62

                                                               = 58.458 m/s

c) average velocity of = (65.72 + 60.83 + 58.458)/3

                                     = 61.67 m/s

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