You stand on the edge of a very tall building with three rocks, which you are going to throw off the edge. you throw the first rock straight outwards, the second rock at an angle 60° above the horizontal, and the third rock 30° below the horizontal.
if you throw all three rocks with the same initial speed, which will be moving the fastest when it hits the ground?
a. the third rock
b. the first rock
c. they will all have the same speed.
d. the second rock