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11 May, 00:31

A 1000-kilogram car traveling with a velocity of 20. meters per second decelerates uniformly at - 5.0 meters per second2 until it comes to rest. What is the magnitude of the impulse applied to the car to bring it to rest?

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  1. 11 May, 00:55
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    -20000 kgm/s

    Explanation:

    Impulse: This can be defined as the product of the mass of a body and its change in velocity. The S. I unit of impulse is kgm/s.

    Mathematically, impulse can be expressed as

    I = m (v-u) ... Equation 1.

    Where I = impulse applied to the car to bring it to rest, m = mass of the car, u = initial velocity of the car, v = final velocity of the car.

    Given: m = 1000 kg, u = 20 m/s, v = 0 m/s (to rest)

    Substitute into equation 1

    I = 100 (0-20)

    I = 1000 (-20)

    I = - 20000 kgm/s

    Hence the impulse applied to the car to bring it to rest = - 20000 kgm/s
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