A. cleaning up after environmental disasters
the answer is (a) molecules
If the gravity decreases on the earth, we will be weightless and pressure will be less exerting on us and we will be able fly
Answer:
a) the mass of the second car = 28000 kg
b) the amount of kinetic energy that was lost in the collision = 
Explanation:
Given that:
mass of the train car
= 6300 kg
speed of the train car
= 12.0 m/s
mass of the second moving car
= ???
speed of the second moving car
= 2.2 m/s
After strike;
they both move with a speed
= 4.00 m/s
a)
Using the conservation of momentum :







b)
To determine the amount of kinetic energy that was lost in the collision;
we will need to find the difference between the kinetic energy before the collision and after the collision;
i.e







Now; the kinetic energy that was lost in the collision is calculated as follows:



