A thread 4 m long can withstand a pulling force of up to 15 N. One end of the thread is fixed in the center of the ice platform

A thread 4 m long can withstand a pulling force of up to 15 N. One end of the thread is fixed in the center of the ice platform, and a washer weighing 150 g is attached to the second. After the point, the washer begins to move around the center of the ice platform. Determine the maximum possible puck speed.

Ice, hence no frictional force
Circular movement:
V ^ 2 = a * R
Newton’s second law:
a = F / m
a = 15H / 0.15kg = 100m / s ^ 2
V = (root) 100m / s ^ 2 * 4m = 20m / s
Answer: 20 m / s