asteringPhysics: HW Ch. 3 Google Chrome Secure https://session.masteringphysics.

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asteringPhysics: HW Ch. 3 Google Chrome Secure https://session.masteringphysics.com/myct/itemView?assignmentProblemID-83594232 HW3- Ch. 3 Exercise 3.6 « previous | 2 of 13 | next Exercise 3.6 Part A A dog running in an open field has components of velocity vr = 3.5 m/s and tly =-1.2 m/s at time t1 = 10.9 s. For the time interval from t 10.9 s to t2-21.4 s, the average acceleration of the dog has magnitude 0.55 m/s2 and direction 36.0 measured from the +-axis toward the +y - axis. At time t2 21.4 s, what is thex-component of the dog's velocity? Express your answer using two significant figures. m/s Submit My Answers ive Up Part B At time t2 21.4 s, what is the y-component of the dog's velocity? Express your answer using two significant figures m/s Submit My Answers ive Up Part C 10:00 PM lype here to search 2 10/6/2017 6

Explanation / Answer

PartA) ax =0.55 cos 36 degree = 0.445 m/s^2

Using first equation of motion, v =u+at

Vx=3.5 + 0.445*(21.4-10.9)

= 8.2 m/s

B) ay = 0.55 sin 36 degree = 0.3233 m/s^2

Similarly vy = - 1.2 + 0.3233*(21.4-10.9)

= 2.2 m/s

C) magnitude v = sqrt (8.2^2 +2.2^2)

= 8.5 m/s

D) direction of dog velocity = arctan (2.2/8.2)

= 15 degree

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