I presume that 8m would be the radius of the circle since not specified.
Direct substitution to the formula F = mv²/R
where F = centripetal force in Newtons (N)
m = mass in kg
v = velocity in m/s
R = radius in meters.
So we have:
F = mv²/R
=100X100 / 8
= 1250 N
= 1.25 kN(kilo Newtons) ANSWER..