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It is necessary to mention that the two triangles are similar.Let the perimeter of the triangle MNP be x cm.Since the triangles XYZ and MNP are similar triangles,8/12 = x/80 (multiply both sides by 80)640/12 = x53.3333... = x53 3/9 = x53 1/3 = xThus, the perimeter of the triangle MNP is 53 1/3 cm.
I'm having some trouble understanding exactly what 'x' has to do with the rectangle. A look at the drawing would really help.
4 times the impact. The formula is 1/2 mass times velocity squared.