posted by JC on .
A rock dropped from a small bridge encounters no air resistance and hits the pond below 1.0 s later.
If it had been thrown horizontally with a speed of 10m/s , then it would have hit the water
A. more than 1.0s later, since it has a greater distance to travel.
B. 1.0s later, since the vertical motion is not affected by the horizontal motion.
C. less than 1.0 s later, since the higher speed would tend to get the ball to the ground more quickly.
Hint: The horizontal component of the velocity does not affect the vertical motion. Whether you simply release the rock at t=0 or throw it horizontally, the initial vertical velocity component is zero.
With that in mind, you should be able to figure out the answer.