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1 August, 13:20

Suppose you throw a small rock over a lake so that it sails over the surface of the water. The rock has a mass of 0.090 kg and is initially moving at 8.0 m/s. How much net force does it take to bring the rock to a stop in 1.00 s?

A. 89 N

B. 0.120 N

C. 0.72 N

D. 0.011 N

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Answers (1)
  1. 1 August, 16:07
    0
    M = 0.09 kg

    v o = 8 m / s

    v = v o - a t

    v = 0 m/s (velocity is zero when the rock stops)

    0 = 8 - a * 1

    a = 8 m/s²

    F = m * a

    F = 0.09 kg * 8 m/s² = 0.72 N

    Answer: C) 0.72 N
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Home » Physics » Suppose you throw a small rock over a lake so that it sails over the surface of the water. The rock has a mass of 0.090 kg and is initially moving at 8.0 m/s. How much net force does it take to bring the rock to a stop in 1.00 s? A. 89 N B. 0.
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