e) a = 1 rồi nên là chỉ còn

\(x=5t+\dfrac{1}{2}t^2\) thôi nhé, mình quên :<

Đổi 18km/h = 5m/s

54km/h= 15m/s

72km/h= 20m/s

a) \(a=\dfrac{v-v_0}{t}=\dfrac{15-5}{10}=1\left(m\text{/}s^2\right)\)

b)

\(s=v_0t+\dfrac{1}{2}at^2=5\cdot10+\dfrac{1}{2}\cdot10^2=100\left(m\right)\)

c)

\(v=v_0+at=5+5=10\left(m\text{/}s\right)\)

d)

\(s=\dfrac{v^2-v_0^2}{2a}=\dfrac{20^2-5^2}{2}=187,5\left(m\right)\)

e)

\(x=5t+\dfrac{1}{2}at^2\)

Tổng số hạt cơ bản trong một phân tử là 210

\(< =>2\left(2p_M+n_M\right)+2p_X+n_X=210\\ < =>4p_M+2n_M+2p_X+n_X=210^{\left(1\right)}\)

Số hạt mang điện nhiều hơn số hạt không mang điện là 54

\(< =>4p_M-2n_M+2p_X-n_X=54^{\left(2\right)}\)

Nguyên tử khối của M lớn hơn nguyên tử khối của X là 48

\(p_M+n_M-p_X-n_X=48^{\left(3\right)}\)

Lấy (1) + (2) VTV

\(< =>8p_M+4p_X=264\\ < =>2p_M+p_X=66\)

Mình nghĩ là đề cho thiếu dữ kiện á

B=> between

D

9. I tried on the shoes and they fitted me (perfect/ perfectly) ___. 

10. He had an accident because he was driving too (fast/ fastly) ___. 

11. Tom drove (careful/ carefully) ___ along the narrow road. 

12. Do you usually feel (nervous/ nervously) ___ before examinations? 

13. Her English is quite (fluent/ fluently) ___. 

14. She fell and hurt herself (bad/ badly) ___. 

15. You look (terrible/ terribly) ___! Are you all right? 

16. He looks at me (angry/ angrily) ___ when I interrupted him.

17. I always feel (happy/ happily) ___ when the sun is shining. 

5A

6D

1. a lovely

2. taller

31. We bought a new car last weekend

32. She hasn't written to her grandparents yet

28, It  is thought that  Maradona was the best football player in the 20th century

29.How many languages are spoken in Germany?

30. Bin had been helped to clean the window yesterday.