→ windgenesis:哎呀,大家都看到了XDDDD 10/13 00:42
學長叫我把這ㄍ答案po 給大家`其實我還沒看到這題ㄝ
Question:
Show that the horizontal and vertical displacement components for a
projectile satisfy an equation of the form △y=a△x+b(△x)^2, so that
the trajectory is a parabola.
`
Answer
: Q=速度 @=角度
: △X=Qcos@ t △Y=ut+1/2at^2
: => t=△X/Qcos@ ==> =Qsin@ t + 1/2(9.8) t^2
: ==> =Qsin@ △X/Qcos@ + 4.9
(△X/Qcos@)^2
: ==> =Qsin@ △X/Qcos@ + 4.9 △X^2/Q^2cos@^@
: ==> *a=Qsin@/Qcos@ b=4.9/Q^2cos@^@
: so.....△y=a△x+b(△x)^2
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