a car traveling 20m/s brakes and takes 3s to stop. what is the acceleration in m/s2?
We went over this in class and the answer is 6.7
To find the acceleration of the car, we can use the formula:
acceleration = (final velocity - initial velocity) / time
Given:
Initial velocity, u = 20 m/s
Final velocity, v = 0 m/s (since the car stops)
Time taken, t = 3 s
Substituting the values into the formula, we get:
acceleration = (0 m/s - 20 m/s) / 3 s
Now, let's calculate the acceleration.
acceleration = (-20 m/s) / 3 s
acceleration = -6.67 m/s²
Therefore, the acceleration of the car is approximately -6.67 m/s². The negative sign indicates that the car is decelerating or slowing down.