​ help please!

Conservation of momentum

m₁ v_{1 =} m₂ v₂

_{5 *3 + 3 *2  = (5+3)} v₂

21/8 = v_{2   = 2.625 m/s}

_{Kinetic energy = 1/2 mv^2      initially     =    1/2 5000 (3^2) + 1/2 3000 (2^2 ) = 2,8500 kg m^/s^2}

     _{after =      1/2 8000  2.625^2 =27,562.5        Difference = 937.5 kg - m^2/s^2}