A 600,000 kg subway train is brought to a stop from a speed of 0.5 m/s by a large spring bumper at the end of
its track which compresses 0.4 m. This transfer of
energy has been loaded onto the spring. What is the
spring constant of the bumper?

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c. 7/3

step-by-step explanation:

a rational number is like pi- it is a repeating decimal.

a. is -1.8

b. 2.236068

c. 2.3333333333333333333

d.   is 3

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the body's situation won't change the forces are equal opposit and on the same body

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

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