14. A ball is fired from a canon straight upward with an intial velocity vo.
Assume no air resistance. If the intial velocity vo is doubled, the time to reach the apex of the trajectory..
A): doubles. B): increases by a factor of 4.
C): Neither of these.
D): Impossible to tell from the information given.
If the intial velocity vo is doubled, the maximum height of the ball..

15. A projectile is fired up at |V0 |=10 m/s
A projectile is fired up at |V0 |=10 m/s. Choose up as (+) direction; ground as y=0. What time does it take to reach ymax, the maximum height?
0 s
1 s
2 s
5 s
None of these

16. A ball is thrown straight up. At the top of its trajectory, its
velocity is zero, acceleration is zero.
velocity is non-zero, acceleration is non-zero.
velocity is zero, acceleration is non-zero.
velocity is non-zero, acceleration is zero.
© Eric Mazur, "Peer Instruction" 1997