The speed of a car is decreasing uniformly from 35 m/s to 15 m/s in 4 s the magnitude of the car's acceleration is

The magnitude of the car's acceleration is equal to -5

Given the following data:

To determine the magnitude of the car's acceleration:

Mathematically, acceleration is given by the formula;

Where:  

Substituting the given parameters into the formula, we have;

Acceleration = -5

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-5m/s²

Explanation:

Acceleration is defined as the change of velocity of a body with respect to time. Mathematically;

Acceleration a = change in velocity/time t

Where change in velocity = final velocity v - initial velocity u

acceleration a = final velocity v - initial velocity u/time t

a = v-u/t

If the speed of a car is decreasing uniformly from 35 m/s to 15 m/s in 4s then;

Initial velocity of the car = 35m/s

Final velocity of the car = 15m/s

Time taken = 4s

Substituting this datas in the formula, we can get the acceleration of the car;

Acceleration = 15-35/4

Acceleration = -20/4

Acceleration = -5m/s²

Negative acceleration shows that the car is decelerating