Two particles at a distance 5m apart,are thrown towards each other on an inclined smooth plane with equal speeds 'v'.Inclined plane is inclined at an angle of 30^(0) with horizontal.It is known that both particles move along the same straight line.The particles collide at the point from where the lower particle is thrown.If the value of v is found to be (10)/(n)ms^(-1) .Then the value of n is