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 θ = 50degree. 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 θb = 70degree. 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 μk = 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 = 3×102 N/m. Right end of the spring is fixed, and all motions are confined in x-y plane. a) Was the collision between the wood block and the bullet elastic or inelastic? Explain quantitively

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 θ = 50degree. 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 θb = 70degree. 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 μk = 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 = 3×102 N/m. Right end of the spring is fixed, and all motions are confined in x-y plane. a) Was the collision between the wood block and the bullet elastic or inelastic? Explain quantitively