If the velocity 𝑣 of a particle moving along a straight line decreases linearly with its displacement s from 20ms −1 to a value approaching zero 𝑠 = 30 m, then acceleration of the particle at s = 15m is

Question : If the velocity 𝑣 of a particle moving along a straight line decreases linearly with its displacement s from 20ms −1 to a value approaching zero 𝑠 = 30 m, then acceleration of the particle at s = 15m is