Correct Answer - D
` x= a e^(alpha t) + b d^(beta t)`
` v= (dx)/(dt) =- a alpha e^(alpha t) + b beta e^(beta t)`
As ` t` increases, the value of ` a alpha e^(alpha t)` decreases slowly and the value of ` b, beta e^(beta t)` increases largely. Thes with incresase in ` t, v` will increase.