time taken by the partical to reach a to b .then distance ab eqal
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Horizontal component of u is ucos60ucos60
=u2=u2
AC=u2AC=u2t=ut2t=ut2
AB=ACsec30AB=ACsec30
=ut223–√=ut223
=ut3–√=ut3
Hence it is the correct answer.
hope find helpful
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