Which statement is true about the vertical velocity for a launched projectile? A. It always increases
B. It's always zero
C. It accelerates at -9.8 m/s^2
D. It is constant

John throws .4 kg ball with velocity of 18 m/s. hits .2 kg bottle and bottle flies 25 m/s. how fast is ball traveling after hitting the bottle?

Am i correct on these two physics questions?

(10 pts! ) the major factor which causes seasonal weather changes on the earth is: a. elliptical orbit b. variation in distance from sun c. tilt of the axis d. atmosphere