Ahorizonatal bridge is built across a ri...

Ahorizonatal bridge is built across a river. A student standing on the bridge throws a small ball vercally upwards with a velocty `4m s^(-1)` . The ball strikes the water surface after `4 s` . The height of bridgeabove water surface is (Take `g =10ms^(-2)` :

`60 m`

`64 m`

`68 m`

`56 m`

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