Two gases—neon and air—are compressed in a closed system from P1 to P2 using a polytropic process with n = 1.5. requires lesser work to be compressed. The gas constants for neon and air are R = 0.4119 and 0.287 kJ/kg·K, respectively.

Which of the following situations is impossible? a) an object has velocity directed east and acceleration directed east. b) an object has zero velocity but non-zero acceleration. c) an object has constant non-zero velocity and changing acceleration. d) an object has velocity directed east and acceleration directed west. e) an object has constant non-zero acceleration and changing velocity.