Question

A body rolls down a stair case of 5 steps. Each step has height 0.1 m and width 0.1m. find velocity with body reach the bottom.
ANSWER IS 5√2m/s

Explain how?

Answer 1

I think answer is wrong

Since each step's two plane are perpendicular to each other so the tangent will be √((5×0.1)^2+(5×0.1)^2)=0.5√2

Therefore distance travelled is 0.5√2

As no parameter is given (i.e. time,force) we assmume that all force is done by gravity

So, v^2=u^2 + 2aS

= 0+ 2×10×0.5√2

or, v= √(10√2)