physics

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an archer at the edge of a cliff fires an arrow from a height of 14.6 m above the ground at the bottom of the cliff. the arrow just clears a rock on a pillar that is 21.7 m above the gound which is 45.2 m horizontally away from the archer.determine
a,the initial speed of the arrow
b,the angle above the horizontal that the arrow is fired at
c,how far past the rock on the pillar that the arrow lands

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