A child threw a stone straight down off a high bridge. The initial velocity of the stone was 15.0 m/s (include units and proper significant

Question

A child threw a stone straight down off a high bridge. The initial velocity of the stone was 15.0 m/s (include units and proper significant figures). How fast was the stone moving the instant before it hit the river 3.00 sec later?

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Minh Khuê 3 days 2021-07-22T14:46:15+00:00 1 Answers 0 views 0

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    2021-07-22T14:48:13+00:00

    Answer:

    The speed of the stone before it hit the river 3.00 sec later. Let v is the velocity at that instant is 45 m/s.

    Explanation:

    Given that, a child threw a stone straight down off a high bridge.

    Initial velocity of the stone, u = 15 m/s

    We need to find the speed of the stone before it hit the river 3.00 sec later. Let v is the velocity at that instant. When it come down, it is moving under the action of gravity. Using equation of motion as :

    v=u+gt\\\\v=15+10\times 3\\\\v=45\ m/s

    So, the speed of the stone before it hit the river 3.00 sec later. Let v is the velocity at that instant is 45 m/s.

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