GENERAL KNOWLEDGE

Detailed explanation-1: -Galileo studied speed and velocity, gravity and free fall, the principle of relativity, inertia, projectile motion and also worked in applied science and technology, describing the properties of pendulums and “hydrostatic balances".

Detailed explanation-2: -Through these experiments, Galileo established that the motion of a projectile is a combination of constant horizontal velocity and vertical motion, in which the projectile accelerates at a rate of 9.8 m s–2.

Detailed explanation-3: -Galileo was the first to properly describe projectile motion as consisting of separable horizontal and vertical components. After close observation, Galileo determined that the only vertical force acting on a projectile was gravity (9.81 meters/second^2).