A particle is moving along the x-axis with its cordinate 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(t)=`5-8t^(2)` At t=1 s, the speed of the4 second particle as measured in the frame of the first particle is given as `sqrtv`. Then v (in m//s)` is