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m = 1 kg
vo = 50 m/s
g = 10 m/s^2
t = 3 s
ditanya:
EK ?
jawab:
vt = vo - gt
vt = 50 - 10 (3)
vt = 50 - 30
vt = 20 m/s
Ek = 1/2 m vt^2
Ek = 1/2 x 1 x (20)^2
Ek = 200 J
m= 1kg
Vo= 50 m/s
g= 10 m/s²
t= 3 s
dit: Ek=...?
Jawab:
Vt²=Vo²-2.g.h
Vt²=50²-2.10.(Vo.t-1/2.g.t²)
Vt²=2500 -20(50.3-5.3²)
Vt²= 400
Vt= 20 m/s
Ek= 1/2.m.Vt²
Ek= 1/2.1.20²
Ek= 200 J