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мιšš муάω
мιšš муάω asked in Science & MathematicsPhysics · 9 years ago

A 3 kg and a 2 kg cart approach each other on a horizontal air track. They collide and stick together. After t?

A 3 kg and a 2 kg cart approach each other on a horizontal air track. They collide and stick together. After the collision their total kinetic energy is 40 J. The speed of the object of two stacked carts is:

4 m/s

6.3 m/s

zero

5.2 m/s

1 Answer

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  • killjoy_
    9 years ago
    Favorite Answer

    Kinetic energy, KE = 1/2 mv^2

    KE = 40 J

    m = 3 + 2 = 5 kg

    so,

    40 J = 1/2 (5kg)v^2

    v^2 = 16

    v = 4 m/s

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