An object with a mass of 0.5 kilogram is swung by a string in a horizontal circle of radius 1 meter at a speed of 2 meters per second. as the speed of the object increases, the force needed to keep it in a circular path will

By definition we have that the acceleration will be given by

a = V ^ 2 / R

Where

V = speed

R = Radio

Substituting

a = (2 ^ 2) / (1) = 4m / s ^ 2

then, the force needed to keep it in a circular path will be

f = m * a = (0.5) * (4) = 2N