с 5 вариантом!!! Очень

Объяснение:

2.

1.are learning

2.are not swimming

3.am not standing,am sitting

4.are not watching,are reading

5.are doing,are not doing

6.am not studying,am studying

7.am reading

8.am not reading

9.are working

10.am meeting

3.

1.is having

2.is writing

3.is playing,are listening

4.are speaking

5.am studying

6.is not crying,is sleeping

7.is not raining

8.is examinating

9.is washing

10.are taking

f=rgv=1000кг/м3х9.8н/кгх2м3=20 000н=20кн

f тяж= mg=4000кг*9.8н/кг=40 000н

f=fтяж-fарх=40 000н-20 000н=20 000н=20кн

s=vt/2=3*10(8)м/с*150с/2=225*10(8)м