7. In a football game, the running back is running up the field. He starts from rest and runs for 3 seconds with an acceleration of 2.5 m/s². What was the magnitude of his displacement?
a. 3.75 m
b. 11.25 m
C. 14.25 m
d. 22.5 m

11.25m

Explanation:

Given parameters:

Initial velocity  = 0m/s

Time of running  = 3s

Acceleration  = 2.5m/s²

Unknown:

Displacement = ?

Solution:

To solve this problem, we apply one of the motion equations.

  S  = ut + at²

   u is the initial velocity

    t is the time taken

    a is the acceleration

 S = (0 x 3)  + (  x 2.5 x 3²)   = 11.25m

i had this question and the answer was 3.15 miles.

martina travels from school to her mom's office. from there, she walks to school. after school, she walks to the library and then to a friends house before finally ending back at home. find martina's total distance traveled.

a) 0 miles  

b) 0.4 miles  

c) 1 mile  

d) 3.15 miles