sara walks part way around a swimming pool. she walks 50 yards north, then 20 yards east, then 50 yards south. the magnitude of her displacement during this walk is yards

+20 yards

Explanation:

Given:

North = 50 yards

East = 20 yards

South = 50 yards

Required

Calculate the magnitude of displacement

Displacement is a vector quantity and it is a measure of distance taken and the direction of the distance.

Take up directions as positive and down directions as negative.

Similarly, we'll take right direction as positive and left direction as negative.

We understand that;

North is upwards; so, the displacement is +50 yards

East is rightwards; so, the displacement is +20 yards

South is downwards; so the displacement is -50 yards

Hence, her total displacement is

Displacement = +50 yards + 20 yards - 50 yards

Displacement = +20 yards

Hence, Sara's displacement is +20 yards

well, you would divide 135 by 33 to get your answer. then that is how many seconds it would take. boardman should fly about 132 m or 4.090909090909091 seconds.