The coordinate of an object is given as a function of time b

nnnnz0ftxw2022-10-04 11:39:542条回答

The coordinate of an object is given as a function of time by x=4t^2-3t^3,where x is in meters(米) and t is in seconds.Its average acceleration over the interval from t=0 to t=2s is:
a)-4m/s^2
b)4m/s^2
c)-10m/s^2
d)10m/s^2
e)-13m/s^2
average acceleration=平均加速度
interval =间隔时间

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ㄟmM‥ 共回答了14个问题 | 采纳率85.7%
x=4t^2-3t^3
v=8t-9t^2
average acceleration
= (v(2)-v(0))/2
= (8*2-9*2*2)/2
= -10 meters/second^2
1年前
寒玉石竹 共回答了1个问题 | 采纳率
很容易得:v(t)=8t-9t^2;
a(t)=8-18t;
average acceleration=对a(t)在[0,2]上进行积分,然后除以2;
答案为-10m/s^2;即选C
1年前

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