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.

The step down transformer reduces this voltage to 6 volts. The string wire of the sonometer is a non-magnetic metallic wire like brass or copper. A horse shoe magnet is placed at the middle of the sonometer wire so that the magnetic field is applied perpendicular to the sonometer wire in a horizontal plane.

Hope this helps!