Question

please bantu dengan caranya​

Answer 1

Verified answer

Jawaban:

1.

m = 350 g = 0,35 kg

h = 20 m

Em = Ep

Em = mgh

Em = 0,35 x 10 x 20 = 70 J

2.

m = 1000g = 1 kg

v2 = 72 km/jam = 72 000/3600 = 20 m/s

h1 = ?

Em1 = Em2

Ep1 + Ek1 = Ep2 + Ek2

Ep1 + 0 = 0 + Ek2

mgh1 = 1/2mv2²

10 x h1 = 1/2 x 20²

h1 = 20 m

3.

m = 200g = 0,2 kg

v1 = 50 m/s

h = 10 m

Kekekalan energi mekanik

Em1 = Em2

Em1 = Ep1 + Ek1 = 0 + Ek1 = 1/2 mv1²

Em1 = 1/2 x 0,2 x 50²

Em1 = 250 J

*maaf klo tdk benar

*biasakan cari jawaban lain utk dibandingkan

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