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A block is sliding down a friction compensated runway .Which of the following statements is/are correct?

1)the speed of the block is increasing
2)the normal reaction acting by the runway on the block is increasing
3)the net force acting on the block is zero

a(1) b(3) c(1)(2) d(2)(3)
why the ans is B and why other (1)(2)statements are wrong?can any on EXPLAIN to me?

  • Physics - ,

    The question does not explain the meaning of "friction compensated runway". Apparently they mean the slope is adjusted to match the downhill (gravity) and friction vectors so that there is no acceleration.

    The confusion in this case is with whoever created that question.

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