You drive an old truck along a straight road at 20.0 km/hr for 15 km until it runs out of gas. For the next 30.0 minutes, you walk 2.0 km further up the road to a gas station at constant velocity. Suppose it takes 1 hour to pump the gas, pay for it, and walk back to the truck. What is the average velocity vav from the start of the drive to returning to the truck? Give your answer in units of km/hr.

Gasoline comes from petroleum, which is made from ancient living things. petroleum, therefore, contains a type of energy. a. heat b. nuclear c. biological d. chemical potential

Calculate the first and second velocities of the car with four washers attached to the pulley, using the formulas v1 = 0.25 m / t1 , and v2 = 0.25 m / (t2 – t1) where t1 and t2 are the average times the car took to reach the 0.25 and the 0.50 meter marks. record these velocities, to two decimal places, in table e.

22. the top of a cliff is located a distance h above the ground. at a distance h/2 there is a branch that juts out from the side of the cliff, and on this branch a bird's nest is located. two children throw stones at the nest with the same initial speed, one stone straight downward from the top of the cliff and the other stone straight upward from the ground. in the absence of air resistance, which stone hits the nest in the least amount of time?