tolong bantu no 21 dan 23 yaa pakai cara (kl bisa difoto) makasii

No. 21

Dik :
t1 = 3 s
t2 = 4s
v = 340 m/s

Dit : S total

s1 = v . t1 / 2
= 340 m/s . 3s / 2
= 510 m

s2 = 340 m/s . 4 s / 2
= 680 m

s total = s1 + s2
= 510 m + 680 m
= 1.190 m

OPTION C

No. 23

Dik : R paralel :
R1 = 3 ohm
R2 = 2 ohm
R3 = 4 ohm

I = 2 A

Dit : V

R4 = R2 + R3 = 2 + 4 = 6 ohm

R total = R1 × R4 / R1 + R4
= 3 × 6 / 3 + 6
= 18 / 9 = 2 ohm

V = I R
= 2 A × 2 Ohm
= 4 Volt

OPTION D

DONE

*21
s = v.t / 2
= 340.(3+4) / 2
= 340.7 / 2
= 1190 m (C)

*23
1/R AB = 1/3 + 1/(2+4)
1/R AB = 1/3 + 1/6
1/R AB = 3/6
R AB = 2 Ω

V AB = I.R AB = 2.2 = 4 V (D)