1.

Ona statightroada policemanin ajeepchasesathiefwitha speedv.Whenthe thiefis adistancedfromthepolice- jeep, thethiefescapeswitha bikewitha constantaccelerationa.The policecancatchthe thiefifv^(2)ge2 ad - proveit .

Answer»

Solution :F thevelocityof thebikeof thethiefincrease from0 tovin timet ,
V= ator ,`t= ( v) /(a)`
thedistancetravelledby thethiefin timet ,
` s =(1)/(2)at^(2)=(1)/(2)a ( (v)/( a))^(2)= ( 1)/(2)( v^(2))/(a)`
the distancetravelledbythepolice- jeepin timethas TOBE atleast( s+d) .
hence, v `* ((v)/(a)) ge s+d`
or ,` (v^2)/(a )ge(1)/(2)( v^(2))/(a)+ DOR ,(1)/(2) (v^(2))/(a)ged `
`or ,v^(2)ge2ad `


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