1. A boy moves on a skateboard at a constant velocity of 3 m-s-'. The combined mass of the boy and the skateboard is 40 kg. He catches a bag of
flour of mass 5 kg that is thrown to him horizontally at 6 m-s-!. Determine
the velocity of the boy after catching the bag of flour. (2 m-s ' in his original
direction)

2 m/s

Explanation:

I'm guessing by the proposed answer that the flour bag is thrown at the boy in the opposite direction he is initially moving

Conservation of momentum

40(3) + 5( -6) = (40 + 5)v

v = 2 m/s

answer: a ball

explanation: because it will bounce

atomic = no of protons.

mass number-atomic number = neutron number