Recent content by m_scott

actually i think its speed be constant? cause no work is being applied.

Homework Statement If the net work done on a particle is zero, what can be said about its speed. And why? The Attempt at a Solution is the speed also zero?

so when you find displacement in the horizontal direction, you shouldn't ever use 0 as your final velocity? You can only use 0 as your final velocity for the y componenet? And SammyS, he used vavg=(v0+v)/2 to get his answer. is the acceleration not constant? (btw, i realize his time is...

Homework Statement http://www.khanacademy.org/video/2-dimensional-projectile-motion--part-3?playlist=Physics Skip video to 4:40. He says that the average velocity in the horizonatal direction is the same as the initial velocity (7.07m/s) because it doesn't change. but wouldn't the velocity...

But the problem doesn't give me the total velocity

Ok. How do I find the initial component of velocity in the y direction? Btw, sorry for all the newb questions. This is my 3rd day in physics and I am kinda lost...

s=v0t+(1/2)at2?? And if so, do i plug in -9.8 for a and 0 for v0? i got 1.6s Is that for the x or y axis?

what equation should i use to find motion for the x and y axis?

I still don't completely understand. What formulas am i supposed to use? And I am not sure what to do with the .330m I set it up as: 0(final velocity)= v02+2(-9.8)(12.6) and got 15.7 but i know that's wrong...

Homework Statement A tennis player standing 12.6m from the net hits the ball at 3 degrees above the horizontal. To clear the net, the ball must rise at least .330m. If the ball just clears the net at the apex of its trajectory, how fast was the ball moving when it left the racquet...