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(b) A block of mass 0.45 kg is at rest on the top of a plane inclined at 20∘ to the horizontal. A bullet of mass 0.05 kg moving at 100 ms−1 parallel to the plane strikes the upper part of the block and gets embedded in it and the two travel together down the plane. Use the laws of conservation of momentum and energy to determine: i) How fast the bullet and block will be travelling before reaching bottom of the plane. [3] ii) The coefficient of friction between the block and plane. [7]

(b) A block of mass 0.45 kg is at rest on the top of a plane inclined at 20∘ to the horizontal. A bullet of mass 0.05 kg moving at 100 ms−1 parallel to the plane strikes the upper part of the block and gets embedded in it and the two travel together down the plane. Use the laws of conservation of momentum and energy to determine: i) How fast the bullet and block will be travelling before reaching bottom of the plane. [3] ii) The coefficient of friction between the block and plane. [7]

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(b) A block of mass 0.45 k g is at rest on the top of a plane inclined at 20 ∘ to the horizontal. A bullet of mass 0.05 k g moving at 100 m s − 1 parallel to the plane strikes the upper part of the block and gets embedded in it and the two travel together down the plane.
Use the laws of conservation of momentum and energy to determine: i) How fast the bullet and block will be travelling before reaching bottom of the plane. [3] ii) The coefficient of friction between the block and plane. [7]

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