Physics

To find the acceleration, we first need to convert the initial speed from kilometers per hour (km/h) to meters per second (m/s).

 

Convert 72 km/h to m/s:

 

Calculate the acceleration using the formula:

Where:

is the change in velocity

is the time taken

 

Initial velocity (u) = 20 m/s

Final velocity (v) = 0 m/s (the car comes to a stop)

Time (t) = 4 seconds

 

Calculate the change in velocity ():

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