An athlete swims the length of 50m pool in 20sec, and
takes the return to the trip in 22 sec.
find the average veloity and speed
in the first half of the swim and in the second half of the swim. pls me . i need to know the answer.!

How does the image distance (di) of a convex lens compare with the image distance of a concave lens? a. the image distance of the convex lens is positive, and that of the concave lens is negative. b. both are negative for a virtual image. c. both are positive for a virtual image d. the image distance of the convex lens is negative, and that of the concave lens is positive.

Aballet student who learns with the of his instructor is demonstrating learning.

In positive numbers less than 1, the zeros between the decimal point and a non-zero number are blank significant