Problem 1 A 5.0 kg box has an unknown initial velocity, Vo, when it runs into a light spring of force constant, k = 5000 N/m, and compresses the spring to a maximum distance of 5.0 cm. The kinetic coefficient of friction between the block and the surface is 0.25. Use the work-energy theorem to find the initial velocity of the block. Do not use conservation of mechanical energy to solve this problem. Show all work for full credit.

Please show all work

Assignment 3 Energy and Work GRASS means Your work must be clear to read. Clearly label all cases (a, b). Show all steps in GRASS format. given/required/analysis/solution/statement. You can type your solutions and answers, but neat handwriting is perfectly acceptable. Please submit your assignment as ONE PDF file on D2L. I do not accept any assignments via email after the due date. 17 Problem: An applied force of 20 N accelerates a block across a level, frictionless surface from rest to a velocity of 8.0 m/s in a time of 2.5 s. Calculate the work done by this force.

Part A The two ropes seen in (Figure 1) are used to lower a 255 kg piano exactly 8 m from a second-story window to the ground. How much work is done by w? Express your answer in joules. ν ΑΣφ ? W = J Submit Request Answer Part B How much work is done by T1? Express your answer in joules. ? W = J Submit Request Answer Part C How much work is done by T2 ? Express your answer in joules. ΑΣφ ? W = J Submit Request Answer Figure 1 of 1 Provide Feedback 1830 N 1295 N 60° 45° 2500 N