A man swims from a point A on the bank of a river if width 100 m. When he swims perpendicular to the water current, he reaches the other bank 50 m downstream. The angle to the bank at which he should swim, to reach the directly opposite point B on the other bank is. .

A man swims from a point A on the bank of a river if width 100 m. When

1.	A man swims from a point A on the bank of a river if width 100 m. When he swims perpendicular to the water current, he reaches the other bank 50 m downstream. The angle to the bank at which he should swim, to reach the directly opposite point B on the other bank is. .
Answer» `10^@` upstream `20^@` upstream `30^@` upstream `60^@` upstream Solution :(d) REFER to (Fig. S5.68) (a), `tan THETA = (v_w)/(v_m) = (50)/(100) = (1)/(2) or v_m = 2v_w` Refer to (Fig .S5.68) (B), `sin prop = (v_w)/(v_m) = (v_w)/(2 v_w) = (1)/(2)` or `theta = 30^@` So, it is `60^@` upstream. (a) ,