Question $4$

$1$ pts

A planet orbits a star along an elliptical trajectory. At point $P$ the planet moves at $1200\frac{m}{s}.$ At point $Q$ the planet moves at $1800\frac{m}{s}.$ The work $(W)$ done by gravity on the planet as it moves from $P$ to $Q$ is:

More information is needed to determine.

$W=0$

$W<mn>0</mn>$

$W>0$