Differential Calculus (id: 20361aa11)

本题目来源于试卷: Differential Calculus，类别为 IB数学

[填空题]
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A particle P moves in a straight line for six seconds. Its acceleration during this period is given by $a(t)=-2t^2+13t-15$, for $0\le t\le 6$ .
1. Write down the values of t when the particle's acceleration is zero.      
2. Hence or otherwise, find all possible values of t for which the velocity of P is increasing.$a<t<b$ a =    b =   

The particle has an initial velocity of 7 ${\mathrm{ms}}^{-1}$ .
3. Find an expression for the velocity of P at time t .   
4. Find the total distance travelled by P when its velocity is decreasing.   

参考答案:
空格1: {1.5|5}±2%  空格2: {1.5|5}±2%  空格3: 1.5±2%  空格4: 5±2%  空格5: -2*t^3/3+13*t^2/2-15*t+7  空格6: 13.6±2% 


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