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- In the figure below, a 2.9 kg block is accelerated from rest by a compressed spring of spring constant 644 N/m. The block leaves the spring at the spring's relaxed length and then travels over a horizontal floor with a coefficient of kinetic friction uk = 0.25. The frictional force stops the block in distance 8.1 m. What was the original compression distance of the spring?Hoe do scientist define mass in terms of kilograms?(2) The box with M = 40kg shown below is being pulled by two pulleys exerting forces F₁ = 400 N (0₁ = 60°) and F₂ = 200 N (0₂= 15°) up an incline with an angle 0₁ = 30°. If the uk = 0.15. What is the acceleration of the box? Would the F₁ or F₂ be enough alone to pull the box up if the other pulley would stop working?