If two liquids of same volume but different densities ρ1 and ρ2 are mixed, then density of mixture is given by
If two waves having amplitudes 2A and A and same frequency and velocity, propagate in the same direction in the same phase, the resulting amplitude will be
If two vectors and
be such that
, then the angle between them is
A body of mass 4 kg moving with velocity 12 m/s collides with another body of mass 6 kg at rest. If two bodies stick together after collision, then the loss of kinetic energy of system is