Mary lives 填介词 Yilin road .直升机空投物资时,可以停留在空中不动,设投出的物资离...Mary lives 填介词 Yilin road .直升机空投物资时,可以停留在空中不动,设投出的物资离开飞机后,由于降落伞的
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Mary lives 填介词 Yilin road .直升机空投物资时,可以停留在空中不动,设投出的物资离...Mary lives 填介词 Yilin road .直升机空投物资时,可以停留在空中不动,设投出的物资离开飞机后,由于降落伞的
Mary lives 填介词 Yilin road .直升机空投物资时,可以停留在空中不动,设投出的物资离...
Mary lives 填介词 Yilin road .
直升机空投物资时,可以停留在空中不动,设投出的物资离开飞机后,由于降落伞的作用在空中匀速下落,无风时落地速度为5m/s.若空投时飞机停留在离地面100m/s高处空投物资,由于风的作用,降落伞在以5m/s速度匀速下落的同时以1m/s速度匀速水平向北运动,求物资在落地时速度的大小.
Mary lives 填介词 Yilin road .直升机空投物资时,可以停留在空中不动,设投出的物资离...Mary lives 填介词 Yilin road .直升机空投物资时,可以停留在空中不动,设投出的物资离开飞机后,由于降落伞的
(1)据位移公式,得:
s=vt
t=s/v
=100/5
=20s
(2)据几何知识得:
v合=根号26
与竖直方向夹角为 arc正切1/5
(3)据位移公式,得:
s=vt
=1×20
=20m
Mary lives 填介词 Yilin road .直升机空投物资时,可以停留在空中不动,设投出的物资离...Mary lives 填介词 Yilin road .直升机空投物资时,可以停留在空中不动,设投出的物资离开飞机后,由于降落伞的
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