Question 1165531
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<pre>

Write the mechanical energy conservation law


    mgh = {{{(mv^2)/2}}}.


Cancel the mass "m" in both side and get


    gh = {{{v^2/2}}}.


From this formula


    v = {{{sqrt(2gh)}}} = {{{sqrt(2*9.8*1.47)}}} = 5.368 m/s.    <U>ANSWER</U>
</pre>