Describe how the student should measure the time taken for the toy parachute to fall from the window

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.

There are weak or strong attractive forces between atoms of liquids with a high viscosity

Write the correct abbreviation for each metric unit