Vx=cos60(4)
x-component of velocity
If you think about it, it makes a right triangle when you combine all the different types of forces together such as v, vx and vy. Then, you can use trigonometry and soh cah toa in order to figure out vx.
The <em>gaseous state</em> of matter does that. A gas expands to take the shape and volume of whatever you put it into.
The answer is 2500 newtons. F = M * A, so 500 kg x 5 m/s = 2500 newtons.