HRWP22p77

You have the initial velocity. Use sine and cosine to break it into components (vx (ihat) + vy (jhat)). Now, you can ignore the horizontal part and just the vertical velocity to find the height at 5.5s (part a). You can also find the vertical (negative) velocity at that time. Combine with the constant horizontal velocity to get the total velocity at that time (part b). Finally, you can find out how long it takes to reach it's maximum height (zero velocity) and calculate how high it will be (a vertical-only equation but watch out for signs).