This is a projectile motion question and the question basically states that an object is launched at $45$ degrees with an initial velocity of $28m/s$ east.
So, how many forces are acting on a projectile when it is passing through the highest point in the trajectory if air resistance is ignored?
According to my textbook answer to a specific question:
If air resistance is ignored, the only force acting is gravity, Fg, and so the net force will be: $Fg = mg = 80 × 9.8 = 784 N$ down
Okay $F_g$ is acting downwards on the object, fine I get this. But isn't the object also moving towards east at constant speed of $28\cos \left(45\right)m/s$ , so shouldn't this mean that the object also has a horizontal force applied to it?