I can't think of anything else :( Is it that the vertical displacement must be greater than R? I used ##d_y = -R## because the ball is initially at rest and it falls to the ground.
Homework Statement
A person standing at the top of a hemispherical rock of radius R kicks a ball (initially at rest on the top of the rock) to give it horizontal velocity ##v_i##. What must be its minimum initial speed if the ball is never to hit the rock after it is kicked?
Homework Equations...
@jbriggs444 Wow, it really was due to rounding! I carried it out to three decimal places and I got the correct answer. Thank you so much! I've been stuck on this for so long; this truly shows the importance of using exact values. :smile:
Homework Statement
In microgravity astronaut training and equipment testing, NASA flies an aircraft along a parabolic flight path. The aircraft climbs from 24,000 ft to 31,000 ft, where it enters a parabolic path with a velocity of 143 m/s nose high at 45.0° and exits with velocity 143 m/s at...