Question

a car can go from 0 - 45m/s in 3.4 seconds A. how much is its acceleration in m/s B. how much longer would it take the car to get up to 70m/s

Answer 1

Answer:

13.2m/s²

1.89s

Explanation:

Given parameters:

Initial velocity  = 0m/s

Final velocity 1   = 45m/s

Final velocity 2  = 70m/s

Unknown:

Time taken  = 3.4s

Solution:

Acceleration is the rate of change of velocity with time.

   Acceleration  = $\frac{Final velocity 1 - initial velocity }{3.4}$    

  Acceleration  = $\frac{45 - 0}{3.4}$   = 13.2m/s²

B. How much longer would it take the car to get up to 70m/s

Maintaining the is acceleration;

       13.2 = $\frac{70 - 45}{t}$  

        25  = 13.2t

          t  = 1.89s