A person is standing on and facing the front of a stationary skateboard while ho

Question

A person is standing on and facing the front of a stationary skateboard while holding a construction brick. The mass of the person is 61.0 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 23.0 m/s relative to the skateboard and we ignore friction, determine the recoil speed of the person and the skateboard. m/s A person is standing on and facing the front of a stationary skateboard while holding a construction brick. The mass of the person is 61.0 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 23.0 m/s relative to the skateboard and we ignore friction, determine the recoil speed of the person and the skateboard. m/s A person is standing on and facing the front of a stationary skateboard while holding a construction brick. The mass of the person is 61.0 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 23.0 m/s relative to the skateboard and we ignore friction, determine the recoil speed of the person and the skateboard. m/s

Explanation / Answer

The total mass of the person plus skateboard = 61.0+4.10 = 65.10 kg

The velocity of brick = 23 m/s

the momentum of brick = 2.50*23 = 57.5 kg m/s

The momentum is conserved because there is no external impulse.

The speed of person = 57.5/(65.10) = 0.88 m/s

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