1 A stone is released from rest on a bridge and falls vertically into a lake. The stone has velocity \(14 \mathrm {~ms} ^ { - 1 }\) when it enters the lake.
- Calculate the distance the stone falls before it enters the lake, and the time after its release when it enters the lake.
The lake is 15 m deep and the stone has velocity \(20 \mathrm {~ms} ^ { - 1 }\) immediately before it reaches the bed of the lake.
- Given that there is no sudden change in the velocity of the stone when it enters the lake, find the acceleration of the stone while it is falling through the lake.