Physics

Question

Find the acceleration of the block.
Find the acceleration of the block.

1 Answer

  • Answer:

    C. 7 m/s²

    Explanation:

    The horizontal forces acting on the block are the 80 N tension, the 60 N tension, and friction.  Apply Newton's second law:

    ∑F = ma

    80 N − 60 N − F = (10 kg) (1 m/s²)

    20 N − F = 10 N

    F = 10 N

    If S₁ goes away, the acceleration becomes:

    ∑F = ma

    80 N − 10 N = (10 kg) a

    70 N = (10 kg) a

    a = 7 m/s²

NEWS TODAY