Question

A drag racer starts her car from rest and accelerates at 11.9 m/s2 for the entire distance of 400 m. What is the speed of the race car at the end of the run?

Answer 1

Speed of the race car at the end of the run is 97.57 m/s

Step-by-step explanation:

We have equation of motion v² = u² + 2as

Initial velocity, u = 0 m/s

Acceleration, a = 11.9 m/s²

Final velocity, v = ?

Displacement,s = 400 m

Substituting

v² = u² + 2as

v² = 0² + 2 x 11.9 x 400

v = 97.57 m /s

Speed of the race car at the end of the run is 97.57 m/s