12. A car traveled 25 km E and stopped for gas, then traveled 45 km Win 1 hour and 45 minutes. What was the car's speed? *

Which of the following are used in an electrochemical cell? a. electrodes b. electrolyte c. terminals d. all of the above

Contains chemical energy. a. heat b. light c. natural gas

Aball is thrown from the top of a building with an initial velocity of 21.9 m/s straight upward, at an initial height of 51.6 m above the ground. the ball just misses the edge of the roof on its way down, as shown in the figure. (a) determine the time needed for the ball to reach its maximum height. (b) determine the maximum height. (c) determine the time needed for the ball to return to the height from which it was thrown, and the velocity of the ball at that instant. (d) determine the time needed for the ball to reach the ground. (e) determine the velocity and position of the ball at t = 5.35 s.