1.The pilot of an airplane traveling 180 km/h wants to drop

来源：学生作业帮编辑：搜搜做题作业网作业帮分类：英语作业时间：2024/07/22 22:44:49

1.The pilot of an airplane traveling 180 km/h wants to drop supplies to flood victims isolated on a patch of land 95 m below.The supplies should be dropped how many seconds before the plane is directly overhead?
2.A batter hits a fly ball which leaves the bat 0.90 m above the ground at an angle of 65° with an initial speed of 28 m/s heading toward centerfield.Ignore air resistance.
(a) How far from home plate would the ball land if not caught?
(b) The ball is caught by the centerfielder who,starting at a distance of 105 m from home plate,runs straight toward home plate at a constant speed and makes the catch at ground level.Find his speed.

1)t=√(2h/g)=4.4s
2)vsinθt-1/2gt²=-h
s=vcosθ×t
u=(d-s)/t
解得：
s=61.7m
u=8.3m/s

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