Question

HELP ASAPPPPPPPP!!!!!***worth 100 points***

.
.
.
.
.
.
.
.
Sally walks 10 meters forward and then 5 meters backwards. Which statement most accurate describes the magnitude of her displacement and distance travelled? A) Sally's displacement is 5m less than her distance travelled. B) Sally's displacement is 10m less than her distance travelled. C) Sally's displacement is 5m greater than her distance travelled. D) Sally's displacement is 10m greater than her distance travelled. Free fall is a situation in which the only force acting upon an object is gravity. Why do all objects in free fall have the same acceleration? A) their masses are always the same B) acceleration due to gravity is always the same C) the distance between two objects is always the same D) the gravitational force between two objects are always the same

Answer 1

Displacement is a vector which means it has direction and can have positive or negative values. Distance is a scalar which means it has no direction and positive only.

Sally walks 10 meters forward and then 5 meters backwards. Forward is postive and backward is negative. Her displacement is +10+(-5) = +5m and her distance is 10+5=15m. So the answer is B) Sally's displacement is 10m less than her distance travelled.

Newton 2nd law states that force = ma. In free fall, the only force is gravity force which is equal to mg where g is gravitational acceleration. The acceleration is always the same because B) acceleration due to gravity is always the same.

Answer 2

Sally walks 10 meters forward and then 5 meters backwards.

forward + backward -

displacement= +10 -5 = +5

distance= 10 + 5 = 15

15-5=10m

so B) Sally's displacement is 10m less than her distance travelled.

Free fall is a situation in which the only force acting upon an object is gravity. force=massxacceleration n gravity force=massx gravity acceleration

so acceleration=gravity acceleration=constant.

ans is B) acceleration due to gravity is always the same