A particle is moving along the x-axis with its coordinate with time t given by x(t) = 10 + 8t – 3t^2. Another particle is moving along the y-axis with its coordinate as a function of time given by y = 5 – 8t^3 m. At t = 1 s, the speed of the second particle as measured in the frame of the first particle is given as √v . Then v (m/s) is