questions in [ motion in two dimensions ] q. [ .. if you know the position vectors of a particle at two points along its path and also know the time interval during which it moved from one point to the other m can you determine the particle's instananeous velocity ? its average velocity ? Explain. q. [.. a projectile is launched at some angle to the horizontal with some initial speed vi and air resistance is negligible . is the projectile a freely falling body ? what is its acceleration in the vertical direction ? what is its acceleration in the horizontal direction ? q. [ ..O stat which of the following quantities , if any , remain constant as a projectile moves through its parabolic trajectory :(a) speed (b) acceleration (c) horizontal compnent of velocity (d) vertical component of velocity .