At time t = 2.3 s, a 4-kg block that initially moveswith a constant speed of 6 m
ID: 1755690 • Letter: A
Question
At time t = 2.3 s, a 4-kg block that initially moveswith a constant speed of 6 m/s undergoes an inelastic collisionwith another block. Any two inertial observers must agreethata. the initial speed of the block is 6m/s.
b. the initial momentum of the block hasmagnitude 24 kg•m/s.
c. the event took place at t =2.3 s.
d. the second block is moving after thecollision.
e. the momentum of the two block system is conserved during thecollision. At time t = 2.3 s, a 4-kg block that initially moveswith a constant speed of 6 m/s undergoes an inelastic collisionwith another block. Any two inertial observers must agreethat the initial speed of the block is 6m/s. the initial momentum of the block hasmagnitude 24 kg•m/s. the event took place at t =2.3 s. the second block is moving after thecollision. the momentum of the two block system is conserved during thecollision.
Explanation / Answer
the observers do not have to agree on the initial speed, initialmomentum, or that the second block is moving. they could bemoving at different velocities or have the same velocity anddirection as the second block. they also do not have to agree on the time of the event, since thetime is arbitrary in this problem. they must agree that the momentum is conserved during thecollision, because momentum is always conserved in an inertialreference frame (ie. classical/non-relativistic physics)
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