A rifle is aimed horizontally at a target 51 rm m away. the, Ask an Expert

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Q. A rifle is aimed horizontally at a target 51 {rm m} away. The bullet hits the target 1.5 {rm cm} below the aim point. What was the bullet's speed as it left the barrel?

Q. When you look down into a swimming pool or a lake, are you likely to underestimate or overestimate its depth? Explain. How does the apparent depth vary with the viewing angle?

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