Ball 1 is thrown straight down from the top of a building with a given initial speed. At the same time ball 2 is thrown straight up from the top of the same building with the same initial speed. Air resistance is negligible. If ball 1 has a speed v just before hitting the ground, what is the speed of the ball 2 just before hitting the ground? V/2
7/4
4v
2v

Asmall metal bar, whose initial temperature was 10° c, is dropped into a large container of boiling water. how long will it take the bar to reach 70° c if it is known that its temperature increases 2° during the first second? (the boiling temperature for water is 100° c. round your answer to one decimal place.) sec how long will it take the bar to reach 98° c? (round your answer to one decimal place.)

Astudent pushes a 60-n block across the floor for a distance of 10 m. how much work was done to move the block

What happens during the fall in september