Physics Practice Problems Projectile Motion: Positive Launch Practice Problems Solution: A javelin thrower standing at rest holds the cente...

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# Solution: A javelin thrower standing at rest holds the center of the javelin behind her head, then accelerates it through a distance of 70 cm as she throws. She releases the javelin 2.0 m above the ground traveling at an angle of 30 above the horizontal. Top-rated javelin throwers do throw at about a 30 m angle, not the 45 ^circ you might have expected, because the biomechanics of the arm allow them to throw the javelin much faster at 30 ^circ than they would be able to at 45 ^circ . In this throw, the javelin hits the ground 63 m away.What was the acceleration of the javelin during the throw? Assume that it has a constant acceleration.

###### Problem

A javelin thrower standing at rest holds the center of the javelin behind her head, then accelerates it through a distance of 70 cm as she throws. She releases the javelin 2.0 m above the ground traveling at an angle of 30 above the horizontal. Top-rated javelin throwers do throw at about a 30 m 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 63 m away.

What was the acceleration of the javelin during the throw? Assume that it has a constant acceleration.

Projectile Motion: Positive Launch

Projectile Motion: Positive Launch

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