How much force is needed to stop a body of mass 10kg​

Astronomers discover an exoplanet (a planet of a star other than the sun) that has an orbital period of 3.87 earth years in its circular orbit around its sun, which is a star with a measured mass of 3.59 x 1030 kg. find the radius of the exoplanet's orbit.

If the force applied to an object remains constant, is more power needed for the object to move faster ? explain

What is the relationship between wavelength of light and the quantity of energy per photon?