Question

My Notes Ask Your Teacher An athlete swims the length of a pool in a time t, and makes the return trip to the starting position in a time (a) If she is swimming Initially in the positive x-direction, determine her average velocities symbolically in (a) the first half of the swim, (b) the second half of the swim, and (c) the round trip. Assume that time ts is from the other end of the pool to the starting point. Use any variable or symbol stated above as necessary. Indicate the direction with the sign of your answer.) first half - second half round trip Vevo (b) What is her average speed for the round trip? average speed - Need Help? Submit Answer

Answer 1

Aus- Given, L time to and mlete makes swims a a round pool trip of to length starting in a position from the fig we can say the athlete takes time ti to go from nzo to nal. Again She takes time tz to swim from n=1 to xoo in the return trip. --- - hoL we different need to case calculate average velocities for the and average speed for one case. e Diplacement covered we know Average speed å time interval is in m L consider and time is will in Here we second . @ If she is swimming in the x-direction. The Average velocity during first half a Displacement covered time interval (L-om (ti-o) s I m 5' Average velocity devring second half a Displacement covered time interval Co-L) m Tt2-43 2.L 2. Et mil

we need to know that for velocity only displacement counts not the total distance covered. In this case in a complete round taip ne at last we get the same position from where we Started so displacement is zero.. Total displacement z L-Leo taip = : Average velocity in complete round Displacement covered time interval But in speed total distance covered round counts. trip- so in complete Total distance = Lt L=22 Hip- :: Average speed in complete yound Total distance time interval 22 m (tit tz] -0,5 (4 ts mal