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r1= 20i + (2+j) -
rt = 32i, besarnya= -/(32)^2= 32 meter, arah= arctan(1/32)=1.79*
B.) v=dr/dt = 4ti
a=dv/dt = 4i, besarnya= -/(4)^2 = 4 m/s^2, arah= arctan(1/4)=14.04*
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