Question

Tlong nomor 14 sampai 20

Answer 1

15) amplitudonya 4

17) diket : m = 2 kg, a = 4 m/s², s = 20 m
 ditanya : W..?
jawab : 
F = m x a = 2 kg x 4 m/s² = 8 N
W = F x s
    = 8 N x 20 m/s²
    = 160 Joule

19) diket : m = 2 kg, h = 10 m, g = 10 m/s²
ditanya : Ep..?
jawab : 
Ep = m x g x h
     = 2 kg x 10 m/s² x 10 m
     = 200 Joule

20) diket : m = 5 kg, v₁ = 2 m/s, v₂ = 4 m/s
ditanya : W..?
jawab :
W = ΔEk
    = 1 x m (V₂² - V₁²)
       2
    = 1 x 5 (4² - 2²)
       2
    = 5 (16 - 4)
       2
    = 5 x 12
       2
    = 30 Joule