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## Homework Statement

A boy launches a 20 g dart horizontally by a spring gun from a balcony 45 m above the ground. The dart lands 15 m away from the balcony. If the length of the gun’s barrel is 10 cm, what is the average horizontal force applied by the spring?

(A) 1.0N (B) 2.0 N (C) 2.5 N (D) 5. N (E) 7.5 N

## Homework Equations

Law of Conservation of Energy, Law of Conservation of Momentum, Kinematics Equations

## The Attempt at a Solution

I tried to use kinematics, but was unable to solve it.

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