- #1
zebra1707
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Projectile motion - urgent help needed
Target is projected at an an angle to the horizontal, initial speed 4 m/s, unknown angle and unknown distance to the target. Height of the target is 0.8m.
Need to find the minimum angle.
v= u+at
v = delta s/delta t
sin theta ?
0 = 4 + (-9.8)t
9.8t =4/9.8
t = 0.408 (0.41) s (i think that this is wrong as it may be the time for the "entire" flight of the projectile.
v = delta s/delta t
v delta t = delta s
4 x 0.41
Delta s = 1.63
sin-1 = 0.8/1.63
angle = 30 degrees
Can the gurus please check this because I think that I have the entire flight of the projectile - not the max height where it will hit the target.
Cheers and thanks.
Homework Statement
Target is projected at an an angle to the horizontal, initial speed 4 m/s, unknown angle and unknown distance to the target. Height of the target is 0.8m.
Need to find the minimum angle.
Homework Equations
v= u+at
v = delta s/delta t
sin theta ?
The Attempt at a Solution
0 = 4 + (-9.8)t
9.8t =4/9.8
t = 0.408 (0.41) s (i think that this is wrong as it may be the time for the "entire" flight of the projectile.
v = delta s/delta t
v delta t = delta s
4 x 0.41
Delta s = 1.63
sin-1 = 0.8/1.63
angle = 30 degrees
Can the gurus please check this because I think that I have the entire flight of the projectile - not the max height where it will hit the target.
Cheers and thanks.