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=Δv /Δt
=(-1i +3j) - (1i +3j) / 2 - 0
= -i+3j-i-3j / 2
= -2i /2
= -i
=Δv /Δt
=(-1i +3j) - (1i +3j) / 2 - 0
= -i+3j-i-3j / 2
= -2i /2
= -i