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UN 2009 17.

Perhatikan gambar disamping!Sebuah benda jatuh bebas dari 20 m. Jika g = 10 m/s2 ,maka kecepatan benda saat berada 15 m diatas tanah adalah.... Pembahasan

Diket;h0 = 20 m h1 = 15 m g = 10 m/s2 Ditanya V=....? Jawab V=√2 𝑔∆ℎ =√2.10(20 − 15) =√20. (5) =√100 =10

52.Sebuah benda bermassa 1 kg,dilemparkan vertikal keatas dengan kecepatan awal 40 m/s2.Bila g =10 m/s2,besarnya energi kinetik saat ketinggian benda mencapai 20 m adalah... Jawab Ek1+Ep1

= Ek2 + Ep2

1

.m.v2 + m.g.h = Ek2 + m.g.h

2 1

.1.(40)2 +1.10.0 = Ek2 +1.10.20

2 1

.1600+0

= Ek2 + 200

800

= Ek2 + 200

Ek2

=800-200

Ek2

=600

2

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