After falling from rest from a height of 28 m a 0.46 kg, Ask an Expert

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Q. After falling from rest from a height of 28 m, a 0.46 kg ball rebounds upward, reaching a height of 18 m. If the contact between ball and ground lasted 1.7 ms, what average force was exerted on the ball?

Q. A rifle is aimed horizontally at a target 54.0 away. The bullet hits the target 1.90 below the aim point. What was the bullet's flight time?

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