2. A 48 kg girl is initially at rest on a 2.8 kg skateboard that is not moving. The girl then steps off the front of the skateboard with a velocity of 1.3 m/s to the right. What is the final velocity of the skateboard?

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.