A ball is moving through the air as shown. Its horizontal position x and vertical position y can be described by two functions: x(t) = a + b*t and y(t) = c + d*t + e*t*t. Here t represents time and a= 84 cm, b=27 cm/s, c=88 cm, d=46 cm/s and e=-490 cm/s/s. What is the magnitude of the initial velocity of the ball? and what is the angle between the initial velocity and the horizontal? Could anyone provide a much needed hint to get going on this problem?