Phiwe drives 180 km to her grandmother’s house. She covers half the distance at 60 km/h and the other half at 100 km/h. On her return trip, she drives half the time at
60 km/h and the rest at 100 km/h.
Apply the problem solving strategy to answer the following questions. Scan and upload your
solutions as pdf or picture files.
(a) What is Phiwe’s average velocity on the way to her grandmother’s house?

Abag of potato chips contains 2.00 l of air when it is sealed at sea level at a pressure of 1.00 atm and a temperature of 20.0 deg c. what will be the volume of the air in the bag if you take it with you, still sealed, to the mountains where the temperature is 7.00 deg c and atmospheric pressure is 70.0 kpa? assume that the bag behaves like a balloon and that the air in the bag is in thermal equilibrium with the outside air.