After the car with an acceleration of 14.5 m/s^2 leaves the platform gravity causes the car to free fall What is the gravitational force on the car? (No air resistance)

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.

Do you agree with scientist’s prediction about the warming of alaska and other polar regions?

What is the weight of a 8-kg substance in n, kn, kg·m/s2, kgf, lbm·ft/s2, and lbf?