Recent content by cixelsyD

  1. C

    Conservation of Momentum in Collision between a Ball and a Truck

    A ball weighing .2kg is traveling 20ms-1 to the left, a 20 000kg truck is traveling 25ms-1 to the right. What is the speed of the ball after the collision (M1V1) + (M2V2)before=(M1V1) + (M2V2)after This seemed so obvious, but i keep getting it wrong. The answer is 70ms-1. The only thing that i...
  2. C

    Vector Addition: Calculating Bird's Speed in Southerly Direction

    A bird can manage 50 KmHr-1 in still air. There is a wind blowing eastward at 30kmhr-1, the bird wishes to travel south. The resultant speed the bird carries in the southerly direction is? For equations i just used vector addition, and pythagorous (A2+B2=C2) The first time i...