a car starts from a stop. at the end of 30 seconds its speed is 20 meters per second. what is the acceleration of the car?
0.7
To determine the acceleration of the car, we can use the formula:
acceleration (a) = change in velocity (Δv) / time taken (t)
Given that the car starts from a stop (initial velocity, u = 0 m/s), and after 30 seconds, its speed is 20 meters per second (final velocity, v = 20 m/s), we can calculate the change in velocity.
Δv = v - u
= 20 m/s - 0 m/s
= 20 m/s
Now, we can substitute the values into the acceleration formula:
acceleration (a) = Δv / t
= 20 m/s / 30 s
Calculating this, we get:
acceleration (a) = 0.67 m/s²
Therefore, the acceleration of the car is 0.67 m/s².