I am so new to physics, and it's just so confusing to figure out which numbers go in what equation and such. Here's a problem I'm struggling with:

A cart is propelled over an

*xy* plane with acceleration components

*ax* = 6.6 m/s2 and

*ay* = -1.6 m/s2. Its initial velocity has components

*v*0

*x* = 7.4 m/s and

*v*0

*y* = 11.0 m/s. In unit-vector notation, what is the velocity of the cart when it reaches its greatest

*y* coordinate?

EDIT: I solved that problem, but here's another one:

A certain airplane has a speed of 80.25m/s and is diving at an angle of θ = 27.0° below the horizontal when the pilot releases a radar decoy (Fig. 4-37). The horizontal distance between the release point and the point where the decoy strikes the ground is d = 747 m. (a) How long is the decoy in the air? (b) How high was the release point?