A rope holding a brick is hanging from the ceiling of an elevator at rest. If the elevator accelerates upwards, the tension in the rope will

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.

Acid precipitation chemically weathering a 5.0-kg limestone rock . which coukd be the result ?

How is the acceleration of an object in uniform circular motion constant? a - in magnitude only b - in direction only c - in both magnitude and direction d - in magnitude, direction & orientation