A roller coaster starts at rest from a height of 110 m, and accelerates down the track to a height of 10.0 m. Find the speed it can reach, assuming no friction.

Question

anonymous · Answer

110-10=.5*9.8*t^2

solve for t 

then v=t*a

I think

ujjwal · Answer

$$v ^{2}=2gh$$ since initial velocity is zero
here h=110-10
find v

anonymous · Answer

here only conservative forces act and thus mechanical energy is conserved.
$$\Delta PE = KE $$
$$mg \Delta h = 1/2 mv^2$$
$$v=\sqrt{2gh}$$