To estimate the height of a bridge over a river, a stone is dropped freely on the river from the bridge.The stone takes 2 s to touch the water surface of the river.Calculate the height of the bridge from the water level.Take $g = 9.8 m / s^{2}$ .

19.6 m

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9.8 m

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21.4 m

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4.9 m

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Solution

The correct option is A 19.6 m
$s = u t + 0.5 a t^{2} = 0 (t) + 0.5 (9.8) (2)^{2}$
$s = 19.6 m$

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Q. 1. Does the acceleration due to gravity depend on the mass of a body?
2. To estimate the height of a bridge over a river, a stone is dropped freely in the river from the bridge. The stone takes 2 seconds to touch the water surface in the river. Calculate the height of the bridge from the water level

(g = 9.8 m s^{- 2})

[3 MARKS]

Q. A stone is dropped in the river from a bridge. The stone takes 1 second to touch the water surface in the river. What is the height of the bridge from the water level?

Q. A stone is thrown from a bridge at an angle of

30^{o}

down with the horizontal with a velocity of

25 m / s

. If the stone strikes the water after

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seconds, then calculate the height of the bridge from the water surface.

(g = 9.8 {m / s}^{2})

Q. A stone is thrown from a bridge at an angle of

30^{o}

with the horizontal in the downward direction with a speed of

25 m / s

. If the stone strikes the water after

2.5 s e c

, then calculate the height of the bridge from the water surface

(g = 9.8 {m / s}^{2})

A stone is dropped into a river from a bridge 125 m above the water. Another stone is thrown vertically down 1.00s after the first is dropped. The stones strike the water at the same time.

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To estimate the height of a bridge over a river, a stone is dropped freely on the river from the bridge.The stone takes 2 s to touch the water surface of the river.Calculate the height of the bridge from the water level.Take g=9.8m/s2.

The correct option is A 19.6 ms=ut+0.5at2=0(t)+0.5(9.8)(2)2s=19.6m

To estimate the height of a bridge over a river, a stone is dropped freely on the river from the bridge.The stone takes 2 s to touch the water surface of the river.Calculate the height of the bridge from the water level.Take $g = 9.8 m / s^{2}$ .

The correct option is A 19.6 m
$s = u t + 0.5 a t^{2} = 0 (t) + 0.5 (9.8) (2)^{2}$
$s = 19.6 m$