A runaway train that has a mass of 70,989 kg and is travelling at a speed of 69 m/s. How much work does Superman do in slowing the train down to a controllable speed of 18?

u can delete ur account.

1. go on google and write

2 open this and click on your profile pic and if your profile is not appearing, then u have to log in.

3. when u click on your profile pic, there appears four options on the top.

4. click on the 1st option and scroll down and go at the bottom.

5. click on edit profile.

6. there appears a option 'prefernces' and at that option at the right side , 'edit' is written.

7. click on the edit option.

8. there is a option " i want to delete my account" and click on that.

hope this u

and ur welcm

: )

what is the actual question though?

i really dont know but i will try okay.

so i think u would just add all them up and get your answer..

friction

explanation:

they us to move forward and backwards