Atrain consists of 50 cars, each of which has a mass 6.8
x10^3 kg. the train has an acceleration of +8.0 x 10^-2m/s^2.
ignore friction and determine the tension in thecoupling a) between
the 30th and 31st cars and b) between the 49thand 50th cars.

Explanation:

Given

mass of each car

acceleration of train

Force required to pull this system

For first car

for second car

this form a pattern of the form

for (a)30 th and 31 st car tension

For 49 th and 50 th car

Answer: it will take   4.36 seconds to reach her average velocity 10.69 miles/hour.explanation:   we have equation of motion ,where s is the displacement, a is the acceleration, u is the initial velocity and t is the time taken.average velocity = displacement/ time taken.average velocity = 10.69 miles/hr = 10.69*1.6*1000/(60*60) = 4.75 m/s4.75 = s/ts = 4. 1we also have acceleration = 2.18 m/s², initial velocity = 0 m/sso it will take   4.36 seconds to reach her average velocity 10.69 miles/hour.

You will hear a hissing sound because of the carbon dioxide escaping the can or bottle