1.A car moves from X to Y with a uniform speed vuv_uvu and returns to X with a uniform speed vdv_dvd. The average speed for this round trip is:a.vuvd\sqrt{v_u v_d}vuvdb.vdvuvd+vu\dfrac{v_d v_u}{v_d + v_u}vd+vuvdvuc.vu+vd2\dfrac{v_u + v_d}{2}2vu+vdd.2vdvuvd+vu\dfrac{2 v_d v_u}{v_d + v_u}vd+vu2vdvuLogin to continueOnly logged in users canattempt or see the solution.
