A particle ,O, of mass U , travelling with a velocity of 3,0×10^7m/s collides elastically with another particle ,P, of mass 16U ,initially at rest . after collision particle O moves in a direction of 90° from its original path Using revolution of vectors and the principle of conservation of momentum ,Calculate the speed of P after collision​

Two cannon balls weighing 18 kg and 24 kg are chained together and fired horizontally with a velocity of 165 m/s from the top of a 21-m wall. the chain breaks during the flight of the cannonballs and the 18-kg cannonball strikes the ground at t = 1.5 s, at a distance of 240 m from the foot of the wall, and 7 m to the right of the line of fire. determine the position of the other cannonball at that instant. neglect the resistance of the air.