Two lawnmower blades are connected by a common point at their corners.$$ If the blades start from rest and are acted on by a counter$-$clockwise moment of $"$ role$=$"presentation"$>$M$=15$t$2$ at the point of connection, how long does it take for the blades to rotate at $2900$ rpm$.$ What is the velocity of the far leading corner of the blade $($point A$)$ when it reaches this angular velocity?$$ Each blade is $12$ inches long by $2$ inches wide and can be treated as a thin plate.$$ The weight of each blade is $0\mathrm{.}5$ pounds.