A projectile is fired straight upward at 135 m/s. How fast is it moving at the instant it reaches the top of its trajectory? My answer: 0 m/s Suppose instead it were fired upward at 35°. What would be its speed at the top of its trajectory? m/s I do not know how to approach this. Does it want vertical speed or horizontal speed? How do I calculate this? and.... Consider an airplane that normally has an air speed of 95 km/h in a 105 km/h crosswind blowing from west to east. Calculate its ground velocity when its nose is pointed north in the crosswind. Magnitude ______ km/h Direction ______° (counterclockwise from east) I have been staring at this problem for the last hour, I do not know how to set this up. Any help would be much appreciated!