Aproton (mass 1 u) moving at 5.40 x 106 m/s collides elastically and head‐on with a second particle moving in the opposite direction at 1.00 x 106 m/s. after the collision, the proton is moving opposite to its initial direction at 5.60 x 106 m/s. find the final velocity (in m/s) of the second particle. [take the proton’s initial velocity to be in the positive direction.]

the answer is a)

mark brainliest

jupiter is the largest planet in our solar system, having a mass and radius that are respectively, 318 and 11.2 times that of earth. suppose that an object falls from rest near the surface of each planet and that the acceleration due to gravity remains constant during the fall. each object falls the same distance before striking the ground. determine the ratio of the time of fall on jupiter to that on earth.