Multiple choice question XXXII — task. Science CBSE, Class 9.

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A man drops a

$10\ kg$ rock from the top of a

$5\ m$ ladder, what is its speed just before it hits the ground What is it kinetic energy when it reaches the ground? (

$g\ =\ 10\ ms{-2}$ )

$10\ ms^{-1}\ and\ 500\ J$
$10\ ms^{-1}\ and\ 1000\ J$
$50\ ms^{-1}\ and\ 5000\ J$
$50\ ms^{-1}\ and\ 1000\ J$

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