Projectile motion is caused by the

Question

1. downward force of gravity and horizontal
motion of velocity.
2. downward force of gravity.
3. horizontal motion of velocity.
4. vertical motion of velocity

Answer 1

DOWN
vertical F = - m g where g is acceleration of gravity
so
a = -g
v = Vi - g t
h = Hi + Vi t - (1/2) g t^2
AND
horizontal u = constant all during flight