a cars speedometer reads 20 m/s after acceleration from standing start, for 25s. what was the magnitude of acceleration?
0.8
To find the magnitude of acceleration, we need to use the equation:
v = u + at
Where:
v = final velocity (20 m/s)
u = initial velocity (0 m/s since it starts from a standing start)
a = acceleration
t = time (25 seconds)
Rearranging the equation, we have:
a = (v - u) / t
a = (20 m/s - 0 m/s) / 25 s
a = 20 m/s / 25 s
a = 0.8 m/s^2
Therefore, the magnitude of acceleration is 0.8 m/s^2.
To find the magnitude of acceleration, you need to use the formula:
acceleration = (final velocity - initial velocity) / time
In this case, the final velocity is given as 20 m/s and the initial velocity is assumed to be 0 m/s since the car starts from a standing start. The time is given as 25 seconds.
Substituting the given values into the formula:
acceleration = (20 m/s - 0 m/s) / 25 s
Simplifying further:
acceleration = 20 m/s / 25 s
Now, divide the numerator (20 m/s) by the denominator (25 s):
acceleration = 0.8 m/s^2
Therefore, the magnitude of acceleration is 0.8 m/s^2.