Acar traveled 60km in 2 hours, 84km in the next hour, and then 68km in 2 hours before reaching its destination. what was the cars average speed?

Select for each of the following statements whether it is correct or incorrect. (a) in an isothermal expansion of an ideal gas. (b) the temperature remains constant. (b) the pressure remains constant. (c) there is work done by the gas. (d) there is heat added to the gas. (e) the change in internal energy equals zero.