A racing motor boat speeds up in a straight line in a lake, from rest.Referring to the acceleration displacement graph for the speeding boat, find speed when it passes a raff at distance of 40 m from the start point.

Explanation

`v=sqrt(v_0^2+2(A))`
where, `A=1/2xx40xx1=20 and v_0 =0`

This gives `v=sqrt40 ~= 6.5 m//s`