What gauge pressure in the water mains is necessary if a

ANSWER:Let’s take the respective masses and velocities of the two ball are, m , m , v = 200 m/s and v = 0. 1 2 1 2We know that if the collision is elastic, then the momentum and kinetic energy of the wholesystem will be conserved during the process.So, let’s impose these conditions.Momentum conservation says, m 1 1 m v =2 2v + m 1 1------2 2------------(1)And kinetic energy conservation says, 2 2 1/2 m 1 1 2 + 1/2 m v2 22 = 1/2 m v1 1 + 1/2 m v2 2 -------------(2)Here we know the initial velocities for both the objects and the masses are also known. Thefinal velocities are unknown. But, these