a 10 kg bomb is moving north with a velocity of 5 m/s. it explodes into three fragments. immediately after the explosion, a 5 kg fragment is moving west with a speed of 8 m/s, a 4 kg fragment is moving east with a speed of 10 m/s, and a third fragment with a mass of 1 kg is moving at speed v. find the speed and direction of the third fragment? group of answer choices 40 m/s north none of these 0 m/s 50 m/s south