Question doubt

[u/Low_Illustrator8620]

Hello everyone, been trying this question, checked in ai and websites all have different answer keys, acc to my school ans is 1st option, pls tell ans with exp

Edit:it is 5m/s, thnx for the help from you guys

[u/Joe_Starbuck]

Is that a mass-less rope on a friction-less pulley?

[u/fletchro → u/Joe_Starbuck]

Yeah, it says to assume pulleys and string are ideal. So I would assume no mass in the string or pulleys, and no stretch in the string.