Scenario – there is a hill with a grassy slope covered in morning frost (ice). Passenger “A” gets into a cardboard box at the top of the hill. Passenger “A” then proceeds to slide down the icy grass hill. The box and passenger eventually skids and stops on the flat ground after the hill. Passenger “A”, having a lot of fun, brings the box back up the hill and invites Passenger “B” for a ride. BOTH Passengers in the box yield a mass that is doubled from the previous run. Supposing the mass is doubled and they are starting from the same height, the stopping distance on the flat ground would be………

Less
Same
2x as far
4x as far
None