Question
The velocity of a body moving along x- axis is given by v =√( 36+2x) where v is in m/s and x is in metre. Find the distance travelled by it in 2 nd second.
The answer is 7.5 m
Joshi sir comment
dx/dt = √( 36+2x)
so dx/√( 36+2x) = dt
now integrate
limits of x are x1 to x2 and that of time are 1 to 2