A horizontal bridge is built across a river. A student standing on the bridge throws a small ball 

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. The ball strikes the water surface after 4 s. The height of bridge above water surface is (Take g = 10 m/s²)
(a) 60 m (b) 64 m (c) 68 m (d) 56
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