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22 tháng 10 2021

giúp j bn

21 tháng 10 2021

a.
Ptcđ xe A: 0,0125t^2
Ptcđ xe B: 400 + 0,01t^2
b. 2 xe gặp nhau thì:
0,0125t^2 = 400 + 0,01t^2
=> t = 400s

v0=0; h=125m; g=10m/s2

a, t=√2hg2hg=5s

v=√2gh2gh=50m/s

b,qd trong 3s: s=1212gt2=45m

qd roi trong giay t3: s= 25m

c, ΔΔs=h-st-1=(1212gt2)-(1212g(t-1)2=45m

she/sing/song/the room/now she/always/get up/6o'clook/everyday

+ She is singing song in the room now

+ She always get up at 6 o'clock everyday

HT

21 tháng 10 2021

TL

She is singing song in the room now

She always get up at 6 o'clock everyday

K cho mik nha

HT

57. During his break, Mr. Pike is used to drinking tea with his fellow peasants.A. workers                       B. associates                 C. mechanics                D. farmers58. Tickets must be purchased two weeks in advance.      A. sold                               B. taken                         C. bought                   D. sent59. We have done everything...
Đọc tiếp

57During his break, Mr. Pike is used to drinking tea with his fellow peasants.

A. workers                       B. associates                 C. mechanics                D. farmers

58. Tickets must be purchased two weeks in advance.

      A. sold                               B. taken                         C. bought                   D. sent

59. We have done everything as planned.

A. programmed          B. thought                   C. said                            D. mentioned

60. His father was a brilliant scientist.

A. famous                   B. mature                    C. intelligent               D. determined

63. I don’t really like getting up early but I have to because I often have lessons at 7.15.

A.    lately               B. late                   C. soon                  D. finally

64. My sister’s interested in teaching profession because she loves working with children.

A. unconcerned     B. worried             C. unhappy            D. bored

65. After the tragic death of Pierre Curie in 1906, Marie Curie took up  the position which her husband had obtained at the Sorbonne.

A. gave away                   B. threw away               C. lost                                    D. left

66. Although it’s a long day for us, we feel we are contented with what we do.

A. dissatisfied                 B. excited                     C. shocked                              D. pleased

Giúp mình với 

1
21 tháng 10 2021

gvgrggg

16 tháng 10 2021

help me

Điểm xe hơi xp là gốc tọa độ , chiều dương
36km/h = 10m/s
Phương trình chuyển động
xe hơi x1= 1/2at^2= t^2
xe tải x2= 10t
để vượt qua thì x1=x2 và t > 0
=> t^2= 10t
=> t=10 s
ở khoảng cách 10.10= 100 m