A horizontal bridge is built across a river. A student standing on the bridge throws a small ball vertically upwards with a velocity 4 m s -1 . The ball strikes the water surface after 4 s. The height of bridge above water surface is (Take g = 10 m s -2 )

1. A. 56 m
2. B. 60 m
3. C. 64 m
4. D. 68 m

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