A ball is thrown vertically upward with a speed v by a man standing on a cliff.
When the ball passes the man on the way down, assuming no air friction:
a) Its speed is equal to v.
b) Its speed is less than v.
c) Its speed is equal to 2v.
2007-10-12 20:24:10 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Physics
Put c down as the ball gains energy on the way down.
2007-10-12 20:31:28 · answer #1 · answered by bestonnet_00 7 · 0⤊ 1⤋
the answer is a)
because the law of conservation of energy states that one can not destroy or create energy and since no energy is being transfered from the ball only converted to Gravitational Potential Energy and on the way down all the GPE is converted back into kinetic energy so it will have a velocity equal and opposite to it's original velocity.
2007-10-13 03:31:31 · answer #2 · answered by polo_player13 2 · 2⤊ 1⤋
C is right
2007-10-13 03:28:02 · answer #3 · answered by aditya tilekar 1 · 1⤊ 2⤋
polo is definitely right its a)
2007-10-13 03:35:48 · answer #4 · answered by David Dodeca 5 · 0⤊ 1⤋