(1.) A projectile is fired straight upward at 137 m/s. How fast is it moving at the instant it reaches the top of its trajectory?
(2.) How fast is it moving at the instant it reaches the top of its trajectory if the projectile is fired upward at 34 degrees from the horizontal?
(3.) Initially (at time t = 0) a particle is moving vertically at 6.1 m/s and horizontally at 0 m/s. Its horizontal acceleration is 1.2 m/s2 . At what time will the particle be traveling 44 degrees with respect to the horizontal?