Mark the correct alternative in each of the following: (W) In \( \triangle A B C, E \) is the mi...

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Mark the correct alternative in each of the following:
(W)
In \( \triangle A B C, E \) is the mid-point of median \( A D \) such that \( B E \) produced meets \( A C \) at \( F \). If \( A C=10.5 \mathrm{~cm} \), then \( A F= \)
(a) \( 3 \mathrm{~cm} \)
(b) \( 3.5 \mathrm{~cm} \)
(c) \( 2.5 \mathrm{~cm} \)
(d) \( 5 \mathrm{~cm} \)
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