A projectile is launched with an initial speed of 30m/s, at an angle 30 above horizontal what is the trajectory of this motion

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.

Phase changes are chemical changes. true or false

Crowbar of 5 metre is used to lift an object of 800 metre if the effort arm is 200cm calculate the force applied