1. B.
2. Mass and velocity.
3. V = 1.5m/0.5s = 3m/s.
M*V = 0.180kg * 3m/s = ___kg*m/s.
4. B.
5. Given: M1 = 120kg, V1 = 4m/s.
M2 = 90kg, V2 = -5m/s.
V3 = -2m/s = velocity of M1 after collision.
V4 = velocity of M2 after collision.
Momentum before = Momentum after
M1*V1+M2*V2 = M1*V3+M2*V4
120*4+90*(-5) = 120*(-2)+90V4
30 = -240+90V4
V4 = 3 m/s.