A glider is initially moving at a constant height of 3.76 m. It is suddenly subject to a wind such that its velocity at a later time t can be described by the equation v(t) = 16.18 − 7.78(1 + t) + 0.70t3, where v and its components are in meters per second, t is in seconds, and the z axis is perpendicular to the level ground.   (a) What was the initial velocity of the glider? (Express your answer in vector form.) vi =       m/s (b) Write an expression for the acceleration of the glider in component form when  t = 2.14 s.  (Express your answer in vector form.) a(t = 2.14 s) =   m/s2

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Projectile Motion