Aprojectile is fired straight up with a positive velocity of 100m/s. when the projectile returns to its starting position, its velocity is?

If the textbook weighs 19.6 newtons on venus,what is the strength of gravity on venus?

Newtons view of arrangement of the universe

Which body is in equilibrium? (1) a satellite orbiting earth in a circular orbit (2) a ball falling freely toward the surface of earth (3) a car moving with a constant speed along a straight, level road (4) a projectile at the highest point in its trajectory