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v(t) = (4t)i + (2t+5)j
v(0.5) = (4*0.5)i + (2*0.5+5)j
v = 2i + 6j m/s
besar v:
|v|= akar (2^2 + 6^2)
= akar (4+36)
= akar (40)
= 2akar10 m/s