Jawabanmu

2014-08-28T21:38:13+07:00
Delta r = dr/dt
=d/dt(2tpngkt2-t)i+tj
=(4t-1)i+1j
=11i+1j
|delta r| = akar 11i pangkat 2+1pangkat2
=akar 121+1=akar 122=11,04m