PHYS 204 Mechanics Final Exam Solutions possible
sample questions and answers 2025 December prep
Concordia University
,PHYS204 Exam Prep Fall 2025
* Required
PHYS 204 Exam Prep
Note: For open-ended problems, answer may be marked as wrong though it is actually correct because rounding
and/or formatting. Make sure to include units in your answer where needed!
3
You push ab object, initially at rest, across a frictionless floor with a constant force for a time
interval Δt, resulting in a final speed of v for the object. You the repeat the experiment, but
with a force twice as large. What time interval is now required to reach the same final speed
v?
* (1 Point)
A. 4Δt
B. 2Δt
C. Δt
D. Δt/2
, E. Δt/4
4
In a perfectly inelastic one-dimensional collision between two moving objects, what condition
alone is necessary so that the final kinetic energy of the system is zero after the collision? *
(1 Point)
A. The objects must have initial momenta with the same magnitude but opposite directions.
B. The objects must have the same mass.
C. The objects must have the same initial velocity.
D. The objects must have the same initial speed, with velocity vectors in opposite directions.
5
A student at the top of a building of height h throws one ball upward with a speed of vi and
then throws a second ball
downward with the same initial speed, vi. How do the final velocities of the balls compare
when they reach the ground? * (1 Point)
A. The ball thrown upward has greater final velocity.
B. The ball thrown downward has greater final velocity.
sample questions and answers 2025 December prep
Concordia University
,PHYS204 Exam Prep Fall 2025
* Required
PHYS 204 Exam Prep
Note: For open-ended problems, answer may be marked as wrong though it is actually correct because rounding
and/or formatting. Make sure to include units in your answer where needed!
3
You push ab object, initially at rest, across a frictionless floor with a constant force for a time
interval Δt, resulting in a final speed of v for the object. You the repeat the experiment, but
with a force twice as large. What time interval is now required to reach the same final speed
v?
* (1 Point)
A. 4Δt
B. 2Δt
C. Δt
D. Δt/2
, E. Δt/4
4
In a perfectly inelastic one-dimensional collision between two moving objects, what condition
alone is necessary so that the final kinetic energy of the system is zero after the collision? *
(1 Point)
A. The objects must have initial momenta with the same magnitude but opposite directions.
B. The objects must have the same mass.
C. The objects must have the same initial velocity.
D. The objects must have the same initial speed, with velocity vectors in opposite directions.
5
A student at the top of a building of height h throws one ball upward with a speed of vi and
then throws a second ball
downward with the same initial speed, vi. How do the final velocities of the balls compare
when they reach the ground? * (1 Point)
A. The ball thrown upward has greater final velocity.
B. The ball thrown downward has greater final velocity.
