A car accelerates from rest to 90km/h in 10 seconds. What is its acceleration inm/s square?
see your previous post
90km/hr (1 hr/3600 s) (1000 m/km) = 25 meters/second
acceleration = change in velocity / change in time
= (25 - 0) / 10 = 2.5 m/s^2
To find the acceleration of the car in m/s^2, you need to convert the speed from km/h to m/s and then divide the change in speed by the time it takes for the change to occur.
First, let's convert the speed from km/h to m/s. To do this, we can use the conversion factor of 1 km/h = 0.27778 m/s.
So, the speed of the car in m/s is calculated as follows:
90 km/h * 0.27778 m/s = 25 m/s
Now, let's calculate the acceleration using the formula:
Acceleration (a) = Change in speed / Time
The change in speed is the final speed minus the initial speed. In this case, the car starts from rest, so the initial speed is 0 m/s.
Change in speed = 25 m/s - 0 m/s = 25 m/s
The time taken for the car to accelerate is given as 10 seconds.
Therefore, the acceleration (a) is calculated as follows:
a = (25 m/s) / (10 s) = 2.5 m/s^2
Hence, the acceleration of the car is 2.5 m/s^2.