Answer:

Explanation:
It is given that,
Mass of object A, 
Initial speed of object A, 
Mass of object B, 
Initial speed of object A,
(at rest)
Le V is the final speed when they lock and move with one common velocity. Using the conservation of momentum to find it.




V = 4.28 m/s
Initial kinetic energy of the system is :



Final kinetic energy of the system is :




Let
is the change in kinetic energy of the system after the collision. It is given by :



So, the change in kinetic energy of the system is 160.89 Joules.
Density is Mass divided by Volume, or;

Your answer is
27 g/cm³.
I believe this is an example of transferred heat. Are there any multiple choice given?
Answer:
Inertia
Explanation:
When the planes moves downward a speed, the weight of the person will decrease a bit due to the amount of g decreases for that particular instant. The person is now experiencing a less than actual weight called as apparent weight due to the upward superposition of inertia on the body as we can see in w = m g .