Answer:
500Km
Explanation:
This question is an example of speed, distance, time.
The formula for working out the distance is: 
To work this out you would need to multiply the speed of 200Km/h by the time of 2.5 hours, this gives you 500 Km. This is because the formula to work out the distance is speed * time.
In adittion, if the train is traveling at 200km per hour then that means that over the course of an hour the distance travelled would be 200Km. So, by multiplying the speed by the time you are working out how far it travelled in that given time.
1) Multiply 200 by 2.5.

Answer:
F = m X a
Therefore ,
Force required = 50 X 30 = 1500 newton
Answer:
Convection
Explanation:
The method of heat transfer that allows heat to rise via vertical transport of heated part of a fluid (gas or liquid) and replace the fluid upper layers is called "convection"
The answer is d) protons were created as the results of the charging process