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{"ops":[{"insert":"1. A wood block of mass mw = 200 g is projected from the ground at a speed v0 = 35 m\/s and at an angle \u03b80 = 50\u00ba. When at height h = 24 m the wood block was hit by a bullet of mass mb = 25 g which was moving at vb = 220 m\/s and at an angle \u03b8b = 70\u00ba. After the collision, the bullet embedded itself in the block and move together and land at point A on the ground. Then they move on the ground that has coefficient of kinetic friction \u00b5k = 0.5 and start to compress a horizontal spring at point B. The distance between point A and B is 18 m and the spring constant k = 3\u00d7102 N\/m. Right end of the spring is fixed, and all motions are confined in x-y plane\n\n\n(a) Was the collision between the wood block and the bullet elastic or inelastic? Explain quantitively. \n\n(b) Find the maximum height from the ground the block with the bullet reached. \n\n\n"}]}
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