Net centripetal force is given by the product of mass and centripetal acceleration
Here we know that
mass (m) = 20 kg
speed (v) = 10 m/s
radius (R) = 15 m
So here we can say that centripetal acceleration is given as
[tex]a_c = \frac{v^2}{R}[/tex]
[tex]a_c = \frac{10^2}{15}[/tex]
[tex]a_c = 6.67 m/s^2[/tex]
now from the formula of force
[tex]F = ma[/tex]
[tex]F = 20 * 6.67 = 133.4 N[/tex]
so correct answer would be 133 N
