Физика 9кл_Перышкин_Гутник_2001_Ответы и решения

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4. vx 5 10

5

-5

t

5. >ey l_eZ , Z f k2 ^ey l_eZ ,, Z f k2. 1. >Zgh t=5c Zo f k2 v0o df q f k GZclb sx. 2. >Zgh t = 20 c Zo f k2 v0o f k GZclb sx. 1. >Zgh s3 f t1 k GZclb s1, a. 2. >Zgh s5 f t1 k t5 k

MijZ`g_gb_

J_r_gb_ sx = v0 o t +

axt 2 2

f k â‹… k

f Hl\_l sx f

0,5 f k 2 â‹… (5 k ) = 2 2

J_r_gb_

axt 2 v v t2 v t ; ao = − 0 x ⇒ sx = v0 o t − 0 x = 0 x = 2 t 2t 2 f k ⋅ k f Hl\_l sx f sx = v0 o t +

MijZ`g_gb_

J_r_gb_ s1 : s2 : s3 = 1 : 3 : 5; s1 : 2 f = 1 : 5 ⇒ s1 = 2 f 5 = 0,4 f; at12 2s 2 ⋅ 0,4 f = 0,8 f/k2. ⇒ a = 21 = 2 2 t1 (1 k) Hl\_l s1 f a f k2. s1 =

J_r_gb_ s1 : s2 : s3 : s4 : s5 = 1 : 3 : 5 : 7 : 9; s1 : 6,3 f = 1 : 9 ⇒ ⇒ s1 = 6,3 f 5 = 0,7 f; at12 2s 2 ⋅ 0,7 f = 1,4 f/k2; ⇒ a = 21 = 2 t1 (1 k)2 v5 = at5 f k2 ⋅ k f k Hl\_l v5 f k s1 =

GZclb v5.

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