Question 113: Motion in 2D & Vectors

Question

The stream of a river is flowing with a speed
of 2km/h. A swimmer can swim at a speed of
4km/h. What should be the direction of the
swimmer with respect to the flow of the river to
cross the river straight ?

Accepted Answer

Draw velocity diagram
$$\sin 	heta  = {{{v_r}} \over {{v_{sr}}}} = {1 \over 2}$$
$$	heta  = {30^o}$$
$$\phi $$ = 90 + $$	heta $$ = 120ÃÂ°

Answer

150°

Answer

120°

Answer

60°

Answer

90°

Motion in 2D & Vectors

The stream of a river is flowing with a speed of 2km/h. A swimmer can swim at a speed of 4km/h. What should be the direction of the swimmer with respect to the flow of the river to cross the river straight ?

Choose the correct answer: