Question

Jwab skrng ya pakai cara

Answer 1

Usahanya 9.000J

Dik

Vo = 0

Vt = 108 km/jam

= 108 × 1.000 m/3.600 s

= 30 m/s

t = 4 s

m = 20 kg

Dit W?

Vt = Vo + at

30 = 0 + 4a

4a = 30

a = 30 ÷ 4 = 7,5 m/s²

S = Vot + 1/2 at²

= (0x4) + (1/2 x 7,5 x 4²)

= 0 + (1/2 x 7,5 x 16)

= 7,5 x 8

= 60 m

F = ma = 20 x 7,5 = 150 N

W = F S = 150 x 60 = 9.000 J

atau bisa dicari

W = perubahan Ek

= Ek t - Ek o

= (1/2 m Vt² )- (1/2 m Vo²)

= (1/2 x 20 x 30²) - (1/2 x 20 x 0²)

= (10 x 900) - 0

= 9.000 J

Kategorisasi

Kelas : VIII

Mapel : Fisika

Materi : Gaya dan Usaha

Kode Kategorisasi : 8.6.1.1.