Acar traveling at 12 m/s slows down at a constant rate
for 4 seconds until it stops. what is its acceleration?

The deceleration of the car is 3 m/s².

Explanation:

So the initial velocity of the car is given as 12 m/s. As the car is said to slow down and then it stops after 4 seconds, so the final velocity is zero.

We know that the acceleration acting on any object to stop the motion of that object is termed as deceleration or negative acceleration.

This is because, acceleration is the ratio of change in velocity to time taken for that change in velocity.

So.,

So the deceleration of the car is 3 m/s².

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the duration of a photographic flash is related to an rc time constant, which is 0.100 μs for a certain camera.