Question

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

Answer 1

Answer:

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 + $\frac{1}{2}$ at²

   u is the initial velocity

    t is the time taken

    a is the acceleration

 S = (0 x 3)  + ( $\frac{1}{2}$  x 2.5 x 3²)   = 11.25m