A twig from a tree drops from a 200 m high cliff on to a beach below. During its fall, 40% of the twig’s energy is converted into thermal energy.
What is the speed with which the twig hits the beach?
1 )
$35 m s^{–1}$
2 )
$40 m s^{–1}$
$49 m s^{–1}$
4 )
$63 m s^{–1}$
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