#1**+15 **

Kinetic energy is (1/2)*mass*velocity^{2}.

Work out (1/2)m1*v1^{2} + (1/2)m2*v2^{2} for the blocks before the collision and then after the collision.

If the energies are the same the collision was elastic; if energy after is less than energy before, it is inelastic; if energy after is greater than energy before, there is a gain in kinetic energy.

Alan Aug 29, 2014

#1**+15 **

Best Answer

Kinetic energy is (1/2)*mass*velocity^{2}.

Work out (1/2)m1*v1^{2} + (1/2)m2*v2^{2} for the blocks before the collision and then after the collision.

If the energies are the same the collision was elastic; if energy after is less than energy before, it is inelastic; if energy after is greater than energy before, there is a gain in kinetic energy.

Alan Aug 29, 2014