[填空题]
A remote-controlled car C is moving along a straight path s, u0)b u+mkzkso thawv* *me oufo:,t its velocityfo, wo*m: ue*v, v, $\mathrm{~ms}^{-1}$ after t seconds, is given by v=$2 \sin t-\cos 5 t+0.1$ , for $0 \leq t \leq 4 $. The initial displacement of C from a fixed point O is 2 metres.
1. Find the displacement of C from O after 4 seconds.
s= m.
2. Find the second time for t , when the particle is at rest.
t= s.
3. Write down the number of times C changes direction.
4. Write down the number of times C is neither accelerating or decelerating.
5. Find the maximum distance of C from O during the time 0 \leq t \leq 4 and justify your answer.
d$_{max}$= m
