2. 1D Motion / Kinematics

A jet moves with a velocity (in $\text{m/s}$) of $v\left(t\right)=-e^{0.5t}+1.5t^2$. What is the jet's acceleration at $t=2.4s$?

The function $a\left(t\right)=4-\sin \left(t\right)$ describes the acceleration of a particle. At $t=0$, the particle is at $x=-20m$ and moving with a velocity of $+2\text{ m/s}$. What is the particle's position at $t=8s$?