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A 0.240 g pebble is fired horizontally at a speed of 18.0 m/s from the top...

A 0.240 g pebble is fired horizontally at a speed of 18.0 m/s from the top of a 38.5 m tall building. Ignoring air resistance, find the momentum when the pebble reaches a height of 25.0 m.

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