A car moving at 45ms-1 and then comes to rest in 5 seconds. Calculate the deceleration of the car.
Acceleration is change.in velocity over time. So, 45/5=?????
To calculate the deceleration of the car, we can use the formula:
acceleration = (final velocity - initial velocity) / time
Given:
Initial velocity (u) = 45 m/s
Final velocity (v) = 0 m/s
Time (t) = 5 seconds
Substituting the values into the formula, we get:
acceleration = (0 m/s - 45 m/s) / 5 seconds
Simplifying the equation, we have:
acceleration = (-45 m/s) / 5 seconds
Dividing -45 by 5, we find:
acceleration = -9 m/s^2
Therefore, the deceleration of the car is -9 m/s^2. Note that the negative sign signifies deceleration, indicating that the car is slowing down.
v=at
a= changeinV/time=45m/s / 5s= 8 m/s^2