Recent content by J827

yeah...the answer key. however, just because it's usually reliable doesn't mean it's infallible. however, this one seems to have been perpetuated for a long time... through Google, I found this problem on several websites, and the answer given almost every time was 10 m. The only site where...

I'm sorry...I don't know what you're trying to hint at here. Are you trying to say that the kinetic energy is still 40 at the top because of the engine? That doesn't make any sense, and is in direct conflict with this: I said that before. The speed at the top is zero, so kinetic energy...

Homework Statement A toy rocket that weighs 10 N blasts straight up from ground level with an initial kinetic energy of 40J. At the exact top of its trajectory, its total mechanical energy is 140J. To what vertical height above the ground does it rise, assuming no air resistance? 2a...

nope, I'm good. :)

while the magnitude of g never changes, how it affects your velocity will depending on how you have defined direction. if I am skiing downhill, my velocity will increase at a rate of 9.8 m/s2. As I ski uphill, however, my velocity will decrease at a rate of 9.8 m/s2. that makes sense &...

*headdesk* :blushing: :smile: thanks.

skiing both ways...conservation of energy/1D kinematic Homework Statement A skier starts from rest at the top of a 45.0-m-high hill, skis down a 30° incline into a valley, and continues up a 40.0-m-high hill. The heights of both hills are measured from the valley floor. Assume that friction...