eringengineering.com/myct/itemView?assignmentProblemID 44644068offset next Homew

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eringengineering.com/myct/itemView?assignmentProblemID 44644068offset next Homewon e.1 Sect 12.1-122 Real. Problem 12.7 Problem 12.7 Express your answer to three significant figures and include the appropriate units. pos on is defned by s=(t,-6t +5) m Submit Correct Part B Determine the the average speed of the paticle when t-7.9s Express your answer to three sigailficant figures and include the appropriate units Value Units (e .Lalue 1 Units | Incorrect; Try Again; 2 attempts remaining Part c Determine the acceleration orn particle wtan 7.9 s Express your answer to three significent figures and inchade the appropriate units Correct

Explanation / Answer

for part b)

first find the distance travelled till speed becomes zero

v = 2t - 6 = 0 => t = 3 sec.

now at this time s = 32 - 6 x 3 +5 = -4 m

also at t = 0 ,,,,s = 5 m

so distance = 5 + 4 = 9 m

now after 3 sec. the particle will move in opposite direction,

and s7.9 = 7.92 - 6x 7.9 +5 = 20.01 m

so distance after 3 sec, = 20.01 + 4 =24.01 m

Total distance = 24.01 + 9 = 33.01 m

avg speed = 33.01/7.9 = 4.1785 m/s

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