Question 1119907
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In Physics, the students solve this problem by applying the Energy Conservation  Law


{{{(m*v^2)/2}}} + {{{m*g*H}}} = {{{(mV^2)/2}}},


where m is the mass of the body, v is the starting velocity (directed vertically up),  V = the final velocity directed 
vertically down (the value under the question) and g = 32 ft/s^2 given in the condition.


Canceling "m" in both sides and simplifying, you get


V = {{{sqrt(v^2 + 2*g*H)}}} = {{{sqrt(48^2 + 2*32*400)}}},


and what you need to do is to use your calculator.
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