Agas occupies 210 ml at -73â°c. to have the same gas occupy 360 ml: should the temperature be increased or decreased? what is the new temperature? k

The relation between volume and temperature is direct, this is the higher the temperature the higher larger the volume.

Therefore, if you want that your gas occupies a larger volumen, you should increase the temperature, assuming other conditions (pressure and number of moles) remain unchanged.

The new temperature may be calculated using the proportion:

V1 / T1 = V2 / T2

=> T2 =  V2 * T1 / V1

T1 and T2 are in absolute degrees, so T1 = - 73 + 273.15 = 200.15 K

=> T2 = 360 ml * 200.15 K / 210 ml = 343

the temperature should be increased to 343 K

Velocity is the speed of an object in a certain direction so you'd need to know speed and direction