The velocity-time graph below shows the journey of a train. How far did the train travel during the whole journey?

How would doubling the made of an object change the objects potential energy

On a day when the barometer reads 75.23 cm, a reaction vessel holds 250 ml of ideal gas at 20 celsius. an oil manometer ( ρ= 810 kg/m^3) reads the pressure in the vessel to be 41 cm of oil and below atmospheric pressure. what volume will the gas occupy under s.t.p.?

As the distance from a magnet increases, what happens to the magnet force?