Who discovered the forces of gravity

Using software, a simulation of a javelin being thrown both on earth and on the moon is created. in both cases, the velocity and angle of projection are kept the same. on earth, the javelin covers a distance y. what distance would it cover on the moon? (the moon’s gravity is about 1/6th that of earth.) a. 6y b. 6/y c. y/6 d. (y+6)2

Explain why the aperture of the spherical mirror should be small compared to the radius of curvature of the mirror.

If the speed of a particle triples ,by what factor does its kinetic energy increase?