. A projectile is fired 20 degrees with 2m/s initial horizontal speed and strikes the floor at a horizontal distance of 1.80 meters away from where it was fired. Determine the time it takes for the projectile to strike the floor.

Question

anonymous · Answer

gravity being -9.8 m/sec^2 yes?

anonymous · Answer

tan20 = vertical speed/2
vertical speed = 2tan20

anonymous · Answer

yes

anonymous · Answer

v = initial velocity + at
0 = 2tan20 + (-9.8)t
velocity is 0 because when it hits the floor the velocity is 0
solve for t and you get how long it stays in the air before striking the floor

anonymous · Answer

I think I'm doing it wrong because the answer choices don't match
the answer choices are...
a)4.28s
b)0.184s
c)0.90s
d)1.89s

anonymous · Answer

hmm i'm doing something wrong here one sec

anonymous · Answer

what equations did you learn in class

anonymous · Answer

oh nvm i have the answer now but thank you :)