Mars orbits the sun at less then 60% of the speed of earth. True or false?

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

An object moves from position +34m to the position -15m in 15 seconds. what is the total displacement? what is the total velocity?

2kg of refrigerant 134a undergoes a polytropic process in a piston-cylinder assembly from an initial state of saturated vapor at 2 bar to a final state of 12 bar, 80 degree c. a)determine the work for the process in kj. b)sketch the process on a p-v diagram.