journal 1

3.4
with no horizantal force acting on the ball there is no horizontal accel the same is true for the projectile-when no horizantal force acts on the projectile the horizantal velocity remains constant.

in the vertical direction there is a force due to grav

ball falls the same verticle distance in the same time

3.5
d=1/2gt (squared)

since there is no horizantal accel the object remains at a constant velocity.

at the top of the arc both velocities are equal

the deceleration due to gravity going up is the same as the acceleration due to gravity

questions

9. they are both constant accel

12.maximum altitude= 90 maximum distance 180....

35. just the verticle velocity because we determined that at the same verticle distance the object will hit the ground at the same time no matter the horizantal distance

36. 2/3 seconds (same as last one)