Connecting Position, Velocity, and Acceleration Practice Test

A car’s velocity is $v(t)=

\sin t$ for $0<t<\pi$. At $t=\frac{3\pi}{4}$, the car is

An object has $s'(t)<0$ and $s''(t)>0$ on $(0,1)$; what is true about $s(t)$ there?