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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