Question

Bantu ya ka butuh segera buat belajar uts

Answer 1

Jawaban:

m = 2 kg

h = 7,2 m

t = 0,5 s

h2 = 0,2 m

a. v2 = ?

Em1 = Em2

Ep1 + Ek1 = Ep2 + Ek2

Ep1 + 0 = 0 + Ek2

mgh = 1/2 mv²

gh = 1/2 v²

v = √2gh

v = √2x10x7,2

v = 12 m/s

b. v2' = ?

v2' = √2gh

v2' = √2x10x0,2 = 2 m/s

c.

e² = h2/h1 = 0,2/7,2

e = 0,16

d.

I = F t = Δp = m(v2' -v2)

F x 0,5 = 2(2 - 12)

F = -40 N

e.

Ep1 = mgh = 2x10x7,2 = 144 J

Ep2' = =2x10x0,2 =  4 J

ΔE = 144-4 = 140 J hilang

*maaf bila tak benar

*biasakan cari jawaban lain utk dibandingkan

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