State a difference between the orbit of a moon and the orbit of a comet.
The radius of a moon's orbit is 420 000 km420\,000\text{ km}420000 km. It takes 28 days28\text{ days}28 days for this moon to complete one orbit. Calculate the orbital speed of the moon. Give a suitable unit.
On the surface of this moon, a small robot launches a scientific probe. The probe has a mass of 80 g and the robot transferred 64 J of kinetic energy to it.
State the equation linking kinetic energy, mass, and velocity.
Calculate the initial velocity of the probe.
At its highest point, the probe had gained 16 J of gravitational potential energy.
State the kinetic energy of the probe at its highest point.
State the equation linking gravitational potential energy, mass, g g\,g and height.
Calculate the maximum height that the probe reached. (gravitational field strength on this moon, g=2.0 N/kgg = 2.0\text{ N/kg}g=2.0 N/kg)
Suggest why the probe travelled further on this moon than it would have on Earth.