Question

The highest barrier that a projectile can clear is 13.8 m, when the projectile is launched at an angle of 14.9° above the horizontal. What is the projectile's launch speed?

Answer 1

Does the initial launching height = 0m?

Answer 2

13.8m

Answer 3

no, can't be, as any launching speed will take projectile higher than 13.8m and it wouldn't matter what (positive) angle we launched on.

Answer 4

ok just solve it the way know