The radar at O is tracking an unpowered projectile A which is subject to gravitational acceleration only. At a particular instant, the radar readings are = 60, R = 2000 m, = 150 m/s and = 15 m/s/s. What is the speed of the projectile at that instant? Hint: R, the distance between the radar and the projectile can be expressed in terms of the horizontal (x) and vertical (y) components of the position of the projectile relative to the radar, i.e. = +