PH-2458

Conservation of energy

Physics · Secondary 4 · Hard · Conservation of energy

A 4.0 kg ball is dropped from rest from a height of 5.0 m. Ignore air resistance. What is the speed of the ball just before it hits the ground? (Take gravitational field strength as

10\,\text{N/kg}

. Use conservation of energy.)

$10\,\text{m/s}$
$5.0\,\text{m/s}$
$14\,\text{m/s}$
$20\,\text{m/s}$

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