Question

in any collision (event), the ______ is always constant.
options: total momentum, energy, total speed, total velocity

Explanation:

In collisions, total momentum is conserved in all cases (elastic and inelastic) as per the law of conservation of momentum. Energy is only conserved in perfectly elastic collisions (some energy is lost as heat/sound in inelastic ones). Total speed and total velocity are not conserved because direction (for velocity) and individual speeds change in collisions.

Answer:

Total Momentum