Một vật dao động trên trục Ox với phương trình x 10sin 2 t / 2 = π + π ( ) cm. Thời điểm vật đi qua vị trí có li độ 5 cm lần thứ 2 theo chiều dương kể từ lúc t = 0 là?

Which explanation describes the forces involved for a person to walk down the sidewalk? a. the person's feet push backward on the sidewalk; the sidewalk pushes backward on the person. b. the person's feet push forward on the sidewalk; the sidewalk does not push on the person. c. the person's feet push backward on the sidewalk; the sidewalk pushes forward on the person. d. the person's feet push forward on the sidewalk; the sidewalk pushes forward on the person.

Suppose you have a box. which of these is not necessarily a true statement regarding the relationship between the force applied to the box, the work done on the box, and the distance the box is moved? a. if the box is not moved, no force is being applied to the box. b. if no force is applied to the box, no work is done on the box. c. if work is done on the box, then a force is applied to the box. d. if work is done on the box, then the box is moved a distance.

Will mark as brainliest how does a catapult increase the trajectory of an object? ps. answer as if u were a 5th grader