The velocity distribution away from the core of a tornado can be approximated as v c/r, where v is the velocity, r is a radial distance from the centre of the tornado and c is a constant. if the velocity at 10km from the core is 20m/s, what is the magnitude of the pressure difference at the ground between two points located at 5km and 7km from the core? = a) 489 n/m^2 b) 511 n/m^2 c) 1000 n/m^2 d) 1511 n/m^2 1997 n/m^2