Smart Suzie walks at a constant 4 m/s for 30 s, then stops for 10 s, then continues at a constant 3 m/s for another 12s. What is Suzie's average speed? (Do you have enough information to find her distances?)

Question

Smart Suzie walks at a constant 4 m/s for 30 s, then stops for 10 s, then continues at a constant 3 m/s for another 12s. What is Suzie&#039;s average speed? (Do you have enough information to find her distances?)

gutsy8v · Accepted Answer

b) Total Distance coveblack = Distance coveblack ini) 30s at a speed of 4m/s +ii) 0m in 10s +iii) 12s at a speed of 3m/sTotal Distance = 30(4) + 0 + 12(3) = 120 + 0 + 36 = 156m.total time = 30s + 10s + 12s = 52sAverage speed = total distance / total time = 156/52 = 3m/s.a) car travels 45m in 7s and then 65m in 10s and then stops in two seconds.Before the car stops speed of car = 65/10 = 6.5 m/sHence decelaration = 6.5 / 2 = 3.25m/s2Distance travelled while the car is stopped = v2 / 2a = (6.5*6.5) / (2*3.25) = 6.5mHence, total distance travelled = 45 + 65 + 6.5 = 116.5Total time = 7 + 10 + 2 = 19sAverage Speed = Total distance / total time = 116.5 / 19 = 6.1316 m/s

Smart Suzie walks at a constant 4 m/s for 30 s, then stops for 10 s, then continues at a constant 3 m/s for another 12s. What is Suzie's average speed? (Do you have enough information to find her distances?)

Answered question

Answer & Explanation

New Questions in High school geometry