[问答题]
A particle moves along a
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7 q9tc.hul ca+traight line such that its velocity, v,$ \mathrm{~ms}^{-1}$ , is given by v(t)=5 t $e^{-1.2 t}$, for $ t \geq 0$ .
1. On the grid below, sketch the graph of v , for $0 \leq t \leq 3$ .
2. Find the distance travelled by the particle in the first 3 seconds.
3 . Find the maximum velocity of the particle in the first 3 seconds.
