In a football game the running back is running up the field. He starts from rest and runs 4 seconds with an acceleration of 1.3m/s^2. What is the magnitude of his displacement

3.38m

Explanation:

Given parameters:

Time  = 4s

Acceleration  = 1.3m/s²

Unknown:

Magnitude of the displacement = ?

Solution:

The body starts at rest and the initial velocity is 0m/s. To solve this problem, we have to use the expression below;

    S   = Ut  + at²

 S  = displacement

t is the time

  a is the acceleration

  U is the initial velocity

  V is the final velocity

Insert the parameters and solve;

   S = (0 x 4)  +   x 1.3² x 4  = 3.38m

a and c

c is 100% but i am confused in a