A person is standing on and facing the front of a stationary skateboard while holding a construction brick. The mass of the person is 59. 0 kg, the mass of the skateboard is 4. 10 kg, and the mass of the brick is 2. 50 kg. If the person throws the brick forward (in the direction they are facing) with a speed of 15. 0 m/s relative to the skateboard and we ignore friction, determine the recoil speed of the person and the skateboard, relative to the ground. M/s