Answer
C .The final velocity is half of train car B’s initial velocity
Explanation
According to the law of conservation of momentum given by the product of mass and velocity, the velocity will be slightly that of the initial one due to increased mass (double mass). Here at least half of the kinetic energy is lost. Momentum is conserved but kinetic energy is converted to other energy forms after an inelastic collision. Kinetic energy is conserved in elastic collisions.
Answer:
for the force that sent the person forward, there is an equal force pushing back on the skateboard
I believe the answer is B, or option 2. It makes the most sense, and is a fact.
Answer:
Carbon Dioxide is a non-flammable gas that extinguishes fire by displacing oxygen
CO2s are designed for Class B and C (flammable liquid and electrical) fires only.