1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Projectile Motion Explaination

  1. Oct 29, 2005 #1
    Two spheres are launched horizontally from a 1.0m high table. Sphere A has a mass of 1.0kg and is launched with an initial speed of 5.0 m/s. Sphere B has a mass B has a mass of 0.4kg and is launched with an inital speed of 2.5 m/s.

    Compare the times for each sphere to hit the floor.
    Compare the distances that each travels from the edge of the table.

    I just need some explaination in the concept of the first question.
    I know the the equation used to find the time is [tex] t = \sqrt{ \frac {2h}{g}} [/tex] and the answer is 0.45s
    But I don't understand why the different masses and velocities don't have an effect on the time to fall.
  2. jcsd
  3. Oct 29, 2005 #2
    the same reason that if you fire a bullet horizontally and drop one at the same instant they will hit the ground at the same instant
  4. Oct 29, 2005 #3
    The initial velocity is perpendicular to the acceleration and has no effect on it, and the acceleration of gravity is independant of mass
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Projectile Motion Explaination