A javelin thrower standing at rest holds the center of the javelin behind her head, then accelerates it through a distance of 70.0 cm as she throws. She releases the javelin 2.00 m above the ground, traveling at an angle of 30.0° above the horizontal. Top-rated javelin throwers do throw at about a 30° angle, not the 45° you might have expected, because the biomechanics of the arm allow them to throw the javelin much faster at 30° than they would be able to at 45°. In this throw, the javelin hits the ground 62.0 m away.
a. At what speed did the javelin leave the thrower's hand?
b. What was the acceleration of the javelin during the throw?
Assume that it has a constant acceleration.
Answer: 25.8 m/s, 475 m/s²