Chapter 3.4, Problem 185E

A projectile is fired at a height of $1.5\text{m}$ above the ground with an initial velocity of $100\text{m/sec}$ and at an angle of $30°$ above the horizontal. Use this information to answer the following questions:

185. Find the tangential and normal components of acceleration for $r\left(t\right)=a\cos \left(\omega t\right)i+b\sin \left(\omega t\right)j$ at $t=0$ .