Recent content by ejacques

The acceleration near the earth, due to the force of gravity is g. Now every particle when moving in a curve trajectory had a centripetal acceleration towards the center (say the sun) a=(v^2)/R. If this is true why we measure weight only with the account of g? I guess when R is big it might be...

I still don't get how i can find the train initial velocity, it looks like i need it for the position equ. x(t) of the kid. why i can work in a frame where the train is stationary? If i do assume the initial velocity is 0 i do get the answer of 1.5 meters which is the answer given. again, i...

I think, since the train is decelerate the kid will fall off at free falling. the time for that is: y=0.5*9.8*t2 ⇒ t=√(2*y/g)=√(2*3/9.8)=0.8sec. Now i think i need to find what is the distance the train is doing in this time, but i can't figure this out.