Question

stone is released into the river from a bridge. It takes 4s for the stone to touch the river’s water surface. Compute the height of the bridge from the water level.​

Answer 1

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Question:

Stone is released into the river from a bridge. It takes 4s for the stone to touch the river’s water surface. Compute the height of the bridge from the water level.

Answer:

As the ball is fall freely, hence initial velocity is zero. Simple physics equation is used to find the height h of the bridge;

h=u.t + 0.5.g.t^2

= 0 + 0.5x9.8x4^2

= 78.4m

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