Hi I want a full explanation of these questions

1. In some collisions/interactions, the total momentum was zero before, during and after the collision/interaction, yet the total kinetic energy did not remain constant. Use this observation to explain why it is important to distinguish between scalar and vector quantities when analyzing conservation of momentum and conservation of energy.

2. How could the results of this investigation be applied to determine the mass of a sealed refuse bag on board the International Space Station. (The ISS is in constant free fall around the Earth). To really explain your answer, draw a diagram, include some sample numbers ex. room is 8 m long, astronaut has a known mass of 60 kg, stopwatch times of ... and show how you would calculate the mass of the refuse (garbage) bag

3. If we added adjustable friction pads to the carts how would this have affected the results of the investigation? Imagine small little brakes adding a few Newtons of friction force before, during and after the collision/interaction.

Resource: Impulse 2D or Jerk or change in momentum / Conservation of Momentum / Momentum Interactions / Elastic Collisions / Inelastic Collisions / Explosive Interactions