What must be part of a quantitative observation? a change of state a change in size a number a color

Answer with Explanation:

There are two types of Observation:

1.→ Qualitative Observation : In which things are Selected on the basis of Quality ,like Color,Shape , Size ,Behavior,Nature of a person, etc...

2.→Quantitative Observation: Representation is done with the help of numbers ,Alphabets or Special Characters or by Combining all of them.

Option A: A Change of State: It denotes Quality.

Option B: A change in Size : It can be both Quality as well as Quantity.For Example Animal loosing and gaining weight can be represented in terms of both numbers as well Quality.For example :50-30,Fat-Thin.

Option C: A numberIt denotes Quantity.

Option D: A ColorIt denotes Quality.

⇒A Number is : is must a quantitative observation.

the chart show the masses and velocities of two colliding objects that stick together after a collision.

according to the law of conservation of momentum, the momentum of the object after the collision is  

answer

1,500

kg • m/s.