A small 4kg block is tied to the end of 3m string and slides around in a circle on a frictionless table. Suppose the string will break if the tension exceeds 50N. Find the maximum speed the block can have without breaking the string.

• A. 37.5 m/s
• B. 6.1 m/s
• C. 8.7 m/s
• D. 2.8 m/s