Q. A 1.2kg ball drops vertically onto the floor,hitting with a speed of 25m/s. It rebounds with initial speed of 10m/s. If the ball is in contact with the floor for 0.020 s, find the magnitude of the average force on the floor from the ball? show calculation.
Q. What is the final temperature when .032 kg of milk at 11 C is added to .16 kg of coffee at 91 C. Assume the specific heat capactieis of the two liquids are the same as water, and disregard any energy transfer to the liquid's surroundings.