Find the magnitude of acceleration of a jeepney that is initially mooving at 18 m/s and comes to complete stop in 4.2 sec. me! i need it tomorrow given: solution:

With these questions , 15 pts & brainliest

The percent efficiency of a machine can never be 100% (or greater), because in the real world some energy is always converted into a. heat b. work c. input force d. output force

For general projectile motion, when the projectile is at the highest point of its trajectory, its acceleration is zero? a)the horizontal and vertical components of its velocity are zero. b) its velocity is perpendicular to the acceleration. c)the horizontal component of its velocity is zero. d)its velocity and acceleration are both zero.