WORTH 35 POINTS PLEASE AWNSER THEM IN AN HOUR U DONT HAVE TO TAKE AN HOUR AND THEY CAN BE BS AWNSERS. AS LONG AS THERE CORRECT I DONT CARE. I PUT UP ANOTHER ONE WORTH 65 POINTS ASWELL ITS THE SAME PAPER.

When you drop a pebble from height a it reaches the ground with speed v if there is no air resistance. from what height should you drop it so it will reach the ground with three times the speed? (a) 9m (b) 3m (c) 6m (d) 18m

How do the kidneys affect homeostasis

Two students, each riding bicycles, start from the same apartment building and ride to the same building on campus, but each takes a different route. the first student rides 1100 m due east and then turns due north and travels another 1430 m before arriving at the destination. the second student heads due north for 1930 m and then turns and heads directly toward the destination.at the turning point, how far is the second student from the destination?