[问答题]
A particle moves along
h6dr8 lu9yrqc,+9ikw l3xw+ d a straight line s
mx3eys 4:m ay1.*c 2sv:urgl qvt27v iuch 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.
