The position of a cat running from a dog down a dark alley is given by the values of the table.t(seconds)012345s(feet)020306990107 Draw the graph of the function for yourself and estimate the instantaneous velocity of the cat (ft/sec) when t=2

来源：学生作业帮助网 编辑：作业帮 时间：2024/04/28 16:44:35
The position of a cat running from a dog down a dark alley is given by the values of the table.t(seconds)012345s(feet)020306990107 Draw the graph of the function for yourself and estimate the instantaneous velocity of the cat (ft/sec) when t=2

The position of a cat running from a dog down a dark alley is given by the values of the table.t(seconds)012345s(feet)020306990107 Draw the graph of the function for yourself and estimate the instantaneous velocity of the cat (ft/sec) when t=2
The position of a cat running from a dog down a dark alley is given by the values of the table.
t(seconds)012345s(feet)020306990107

 
 Draw the graph of the function for yourself and estimate the instantaneous velocity of the cat (ft/sec) when t=2 

The position of a cat running from a dog down a dark alley is given by the values of the table.t(seconds)012345s(feet)020306990107 Draw the graph of the function for yourself and estimate the instantaneous velocity of the cat (ft/sec) when t=2
Answer:The instantaneous velocity of the cat is 20 ft/sec when t=2.
【解析】按照表格数据,很明显猫咪是在做变速运动,小狗所在的位置为起点,昏暗的巷子为跑道.则按照物理学公式,t=1~5时,对应的加速度分别用a1~a5表示,对应的瞬时速度分别用v1～v5表示,位移s分别用s1～s5表示；t=0时,初速度用V0表示；此外,Δt表示时间差.
【解】依题意,当t=0时,s=0,所以有初速度v0=0；
t=1时,s1=v0×Δt+（1/2）×a1×Δt=0×（1-0）+（1/2）×a1×（1-0）=（1/2）×a1=20,解得a1=40（ft/sec）
所以v1=v0+a1×Δt=0+40×（1-0）=40（ft/sec）；
t=2时,s2=v1×Δt+（1/2）×a2×Δt=40×（2-1）+（1/2）×a2×（2-1）=40+（1/2）×a2=30,解得a2=-10（ft/sec）
所以v2=v1+a2×Δt=40+（-10）×（2-1）=20（ft/sec）
答：t=2sec时,对应的瞬时速度为20 ft/sec.
赠人玫瑰,手留余香!——福来美Flower Magic
楼主以后有需要解答的题目,可以直接百度信息给我.

in the position of One of the chairs is _.Put it back_A out of position,in positionB out of the place,in placeC out of the position,in the positionD into a position,out of a position pre-screening of a position. Leave a place to me,can let me unbridled smile of position,can cry aloud the position .求翻译 谢 the position of the person是什么意思 what does the advertisement list as a benefit of the position?翻译 today there have bee a number of telephone calls from the applicants for the position. The desks are out of position Position of Signatory in the Company A Position offering challenge and responsibility in the realm of interpreter or translater.怎么翻译 请翻译 He landed the position of lead singer in a band. put sb in a position of some of them steer by the position of the sun It was a matter of ____ would take the position .A.who B.whoever A or B why? Neither of the yong men who had applied for a position in the university was accepted.求翻译 you people are at the position of the attention! position against the slant of the guide 如何翻译? It was a matter of ________ would take the position.A.who B.whoever C.whom D.whomeverIt was a matter of ________ would take the position.A.who B.whoever C.whom D.whomever 为什么答案选B?