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Ek = 3,2 J
Dit : v = ?
Ep = 1/2 x m x v^2
3,2 = 1/2 x 0,4 x v^2
3,2 = 0,8 x v^2
v^2 = 3,2/0,8
v^2 = 4
v = 2 m/s
Ek = 3,2 J
Dit: v...?
Jwb:
Ek = m x
3,2 = x 0,4 x
3,2 = 0,2 x
= 3,2 : 0,2
= 32 : 2
= 16
v =
v = 4 m/s