Posted by NeedHelp on Saturday, February 12, 2011 at 11:57pm.
A cannon shell is fired up in the air at an initial speed of 225m/s.
After how much timeis the shell at a height of 6.20 X 102 and heading down. What equation would be used to solve this?

physics  Henry, Monday, February 14, 2011 at 1:49am
Vf^2 = Vo^2 + 2(9.8)d = 0,
(225)^2  19.6d = 0,
50625  19.6d = 0,
19.6d = 50625,
d(up) = 2583m, max.
d = Vot + 0.5gt^2 = 2583  620 = 1963m
225t + 4.9t^2 = 1963,
4.9t^2 + 225t 1963 = 0,
Solve using Quadratic Formula and get:
t = 7.49958s, and t =  48.526.
Use positive value of t.
t(down) = 7.49958s = time to go from
2583m to 620m.
Answer This Question
Related Questions
 science  a shell is fired from the cannon. the shell of mass 30kg is shot with ...
 physics  A cannon fires a shell at an angle of 55.0° above the horizontal. The ...
 physic  3) A shell is fired from ground level with a muzzle speed of 350 ft / s...
 calculus  3) A shell is fired from ground level with a muzzle speed of 350 ft...
 Physics  A cannon fires a shell at an angle of 55.0 above the horizontal. The ...
 physics  A shell fired from the ground with an initial speed of 1.70 x 10^3 m/s...
 physics  A shell is fired from the ground with an initial speed of 1.54 103 m/s...
 physics  A shell is fired from the ground with an initial speed of 1.58 103 m/s...
 Physics  A shell is fired from the ground with an initial speed of 1.68 103 m/s...
 Physics  A shell is fired from the ground with an initial speed of 1.54 ✕...
More Related Questions