A car doing 126 km/h brakes steadily and comes to rest in 200 m. How long does it take to stop, in seconds?

expects 11.4 s

6 checks, 0 agreed

draft 6: failed in solution.rb, line 5 — ArgumentError: braking_to_find_time takes distance as (position of car at end of braking - position of car at start of braking), a formula of quantities; don't work it out, name the quantity and the engine finds it: that formula is what the laws give for car.displacement(during: braking).magnitude, use car.displacement(during: braking).magnitude for distance

solution.rb · draft 6 stopped at line 5

1solve :braking_to_find_time, using: UniformAcceleration do2  objects :car3  car.goes(:braking)45  take speed: car.initial_velocity, distance: car.final_position - car.initial_positionArgumentError: braking_to_find_time takes distance as (position of car at end of braking - position of car at start of braking), a formula of quantities; don't work it out, name the quantity and the engine finds it: that formula is what the laws give for car.displacement(during: braking).magnitude, use car.displacement(during: braking).magnitude for distance6  deduce_from "comes to rest", car.final_velocity => "0 m/s"7  assume x_0: "0 m"89  time = braking.time_taken10  answer time:, in: "s", figures: 31112  conclusion "The car slows down steadily, so the time to stop is the distance over the average speed."13end