Answer:
The answer to your question is: Element
Explanation:
Question 1. The atomic number or proton number of an atom has the symbol Z. This number indicates the number of protons and element has. Each elelement has a specific atomic number, two different atomic numbers mean 2 different elements.
From the options given, we conclude that the element is different.
240 = 0+1/2 (-9.8t
240 = -4.9t
<span>240/-4.9 = t</span><span>
</span>49.0 = t
t= 7.0s
Acceleration is a vector quantity that is defined as the rate at which an object changes its velocity. An object is accelerating if it is changing its velocity.
Answer:
The change in momentum is 
Explanation:
From the question we are told that
The time taken for the stone to stop is 
The net force on the rock is 
The impulse of the rock can be mathematically represented as
Substituting values
Now impulse is defined as the rate at which momentum change
Hence the change in momentum 
of the rock is equal to the impulse of the rock
So
