Ask Question
2 February, 23:18

The acceleration due to the earth's gravity, in si units, is 9.8 m/s2. in the absence of air friction, a ball is dropped from rest. its speed on striking the ground is exactly 60 m/s. for what time interval was the ball falling?

+3
Answers (1)
  1. 2 February, 23:41
    0
    We don't know anything about the amount of distance it travels, but that's okay. The only equation we need here is

    velocity (final) = velocity (initial) + acceleration * time

    vf = vi + (a * t)

    The ball is dropped from rest, so vi = 0 m/s.

    We want it so that the ball hits the ground with a final velocity of 60 m/s, so vf = 60 m/s.

    We are given the acceleration due to gravity, a = 9.8 m/s^2.

    We are solving for the time, t = ?.

    Now we just plug in the values.

    vf = vi + (a * t)

    60 m/s = 0 m/s + (9.8 m/s^2) * (t)

    60 = 9.8t

    60 / 9.8 = t

    t = 6.122 s

    Hopefully this is the right answer.
Know the Answer?
Not Sure About the Answer?
Find an answer to your question 👍 “The acceleration due to the earth's gravity, in si units, is 9.8 m/s2. in the absence of air friction, a ball is dropped from rest. its ...” in 📗 Physics if the answers seem to be not correct or there’s no answer. Try a smart search to find answers to similar questions.
Search for Other Answers