A cоrd runs аrоund twо mаssless, frictionless pulleys. A cаnister with mass m [mass] kg hangs from one pulley, and you exert aforce on the free end of the cord. What must be the magnitude of if you are to lift the canister at a constant speed? Screenshot 2023-02-12 at 18-10-40 9781118230725.pdf - Halliday & Resnick fundamentals of physics ( PDFDrive ).pdf.png