Among the given molecules:
Polar molecules with non-zero dipole moment (\(\mu \neq 0\)): NF\(_3\), H\(_2\)O, H\(_2\)S, HBr, HCl.
Non-polar molecules with zero dipole moment (\(\mu = 0\)): BeCl\(_2\), BCl\(_3\), XeF\(_4\), CCl\(_4\), CO\(_2\), H\(_2\).
A body of mass 1000 kg is moving horizontally with a velocity of 6 m/s. If 200 kg extra mass is added, the final velocity (in m/s) is: