An object of mass 2kg is sliding with a constant velocity of

An object of mass $2 \mathrm{~kg}$ is sliding with a constant velocity of $4 \mathrm{~m} \mathrm{~s}^{-1}$ on a frictionless horizontal table. The force required to keep the object moving with the same velocity is

(a) $32 \mathrm{~N}$

(b) $0 \mathrm{~N}$

(c) $2 \mathrm{~N}$

(d) $8 \mathrm{~N}$.