Asked by naidu
A rock is dropped from a tree of height 25m into a lake of 5m depth below, the rock then sinks to the bottom of the lake with constant speed of 1.5m/s. What is the total elapsed time?
Answers
Answered by
oobleck
find time to drop to water: 4.9t^2 = 25
find time to sink: 1.5t = 5
add 'em up.
find time to sink: 1.5t = 5
add 'em up.
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