5. A stone with mass .8kg is attached to one end of a string .9m long. The string will break if its tension exceeds 60 N. The stone is whirled in a horizontal circle on a frictionless tabletop. Find the maximum speed the stone can attain without the string breaking

Aproduction line at v. j. sugumaran's machine shop has three stations. the first station can process a unit in 7 minutes. the second station has two identical machines, each of which can process a unit in 16 minutes (each unit only needs to be processed on one of the two machines). the third station can process a unit in 10 minutes. ▼ is the bottleneck station, with a bottleneck time of nothing minutes per unit (enter your response as a whole number).