# The displacement of the particle varies with time according to the relation 𝑥 =𝑘 𝑏 [1 − 𝑒 −𝑏𝑡]. Then the velocity of the particle is

Question : The displacement of the particle varies with time according to the relation 𝑥 =𝑘 𝑏 [1 − 𝑒 −𝑏𝑡]. Then the velocity of the particle is

(A) $k\left( e^{-bt}\right)$

(B) $\dfrac{K}{b^{2}e^{-bt}}$

(C) $kbe^{-bt}$

(D) none of these