BITSAT 2018 Slot 2 Solved Paper

A spherically symmetric gravitational system of particles has mass density
ρ={

ρ0‌for r≤R

0 for r>R.

where, ρ0 is a constant. A test mass can undergo circular motion under the influence of the gravitational field of particles. Its speed v as a function of distance r(0<r<∞) from the centre of the system is represented by