M
Michele
Guest
Okay this one stumped me, I thought of doing d=rt, but it didn't work.
Then I tried plugging in 240 into the equation, but then I don't know how to solve? Please help!
An arrow is shot upward with an initial velocity of 128 feet per second. The height (h) of the arrow ia function of time (t) in seconds since the arrow left the ground and can be expressed by the equation h=128t - 16t^2. when will the arrow be at a height of 240 feet?
A: At 3 seconds and at 5 seconds
B: Only at 3 seconds
C: Only at 5 seconds
D: Only at 8 seconds
Please give a brief explanation of how it was solved. Thanks!
Then I tried plugging in 240 into the equation, but then I don't know how to solve? Please help!
An arrow is shot upward with an initial velocity of 128 feet per second. The height (h) of the arrow ia function of time (t) in seconds since the arrow left the ground and can be expressed by the equation h=128t - 16t^2. when will the arrow be at a height of 240 feet?
A: At 3 seconds and at 5 seconds
B: Only at 3 seconds
C: Only at 5 seconds
D: Only at 8 seconds
Please give a brief explanation of how it was solved. Thanks!