Question $7$

$1$ pts

On an alien planet where $g=4\frac{(m)}{s^2},$ when you drop a pebble from a height $H,$ it reaches the ground with a speed $V$ if there is no air resistance. From what height should you drop it so it will reach the ground with twice the speed?

$2H$

$8H$

$\sqrt[\phantom{2}]{2}H$

$16H$

$4$H