A man drops a 10 kg rock from the top of...

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 its kinetic energy when it reaches the ground ? (`g = 10 m//s^(2)`)

`5 m//s , 500 J`

`10 m//s , 500 J`

`10 m//s , 250 J`

None of the above

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