A stone on a string 80 cm long is whirled round a horizontal circle at a steady speed, 14 times in 25 s. What is its acceleration, in m/s²?

1solve :a_whirled_stone, using: UniformCircularMotion do2  objects :stone3  paths :circle4  stone.goes(:round, on: circle)56  take radius: circle.radius, turns: stone.revolutions, time: stone.time_takenNoMethodError: undefined method 'time_taken' for an instance of Physics::PhysicalObject; time_taken is a quantity of Velocity, through UniformCircularMotion, not a method: reach it from a motion, as <motion>.time_taken7  deduce_from "14 times in 25 s", circle.time_taken => "25 s"89  acceleration = stone.centripetal_acceleration10  answer acceleration:, in: "m/s2", figures: 311  conclusion "The stone's speed is steady but its direction changes constantly, so it has a centripetal acceleration toward the centre."12end