1) In any collision, if we find that momentum is NOT conserved, it must mean that
A) the digital video camera used to record the eventmalfunctioned.
B) none of the above
C) there must be net external force/forces acting.
D) we have made a human error.
E) Newton's 2nd Law works in only limited cases.
2) A puck slides with initial velocity 2.0 m/s on a frictionless surface and collides (head-on)inelastically with an identical puckat rest. The pucks stick together after the collision. What is the final velocity of the two pucks?
A) 0.50 m/s
B) 0.25 m/s
C) 1.5 m/s
D) 1.0 m/s
E) 2.0 m/s
3) In this inelastic collision lab, which of the following factorswe do not include in our calculations?
A) angles between velocity vectors and collision axis
B) rotation of the pucks after the collision
C) mass of the pucks
D) velocity of the pucks
E) none of the answers