Newton observed the action of a prism on the white light and on red light. Because he did not control the event, this investigation of light was an observational study.
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The change in momentum of the car is 45,000 kg m/s
Explanation:
The change in momentum of an object is given by:

where
m is the mass of the object
u is its initial velocity
v is its final velocity
For the car in this problem, we have
m = 900 kg
u = 30 m/s
v = 80 m/s
Therefore, the change in momentum is:

Learn more about momentum:
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Answer: d
Explanation: divide it by 4
Answer:
B
Explanation:
The mass of something before it's been processed is the same as it's mass after the process.
Answer:
Explanation:
We can use the Einsten's relation which states the equivalence between mass and energy:
where
E is the energy
m is the rest mass of the object
c is the speed of light
By using this formula and m=2.5 kg, we can find the equivalent energy of the object: