- #1
ubergewehr273
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Homework Statement
A body is dropped from a height ##h## with an initial speed 0, reaches the ground with a velocity of 3 km/h. Another body of the same mass was dropped from the same height ##h## with an initial speed 4 km/h. The second body will reach the ground with what velocity ?
Homework Equations
##v^2 = u^2 + 2as##
The Attempt at a Solution
From the equation,
For the 1st body, ##u=0##; ##a=g=10m/s^2##,
Therefore ##v=\sqrt{2gh}##
##\Rightarrow## ##h=0.0347 m##
For the 2nd body, ##u'=4 km/h##; ##a=g=10m/s^2##; ##h=0.0347 m##,
Therefore ##v'=\sqrt{u^2 + 2gh}##
##\Rightarrow## ##v'=\sqrt{1.23+0.7}##
where ##v'## is the final speed of 2nd body.