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h=20m
a. Ep saat t=1s ?
b. W=?
a)
h = vot+ 1/2 gt²
h= 0 + 1/2 x 10 x 1²
h= 5 m
Ep= m x g x h
Ep = 2 x 10 x 5
Ep = 100 J
b)
W = Δmgh
W = mg (h1-h2)
W = 2 10 (20-10)
W= 200 J