Which principle do you think is the most important , conservation of momentum or conservation of energy?

Which quantity has the same unit as the rate of change of momentum?

(A) Acceleration

(B) Energy

(C) Weight

(D) Work

(E) Force

A railway truck of mass $8000 \mathrm{kg}$ travels along a level track at a velocity of $2.5{ \mathrm{ms}}^{-1}$ and collides with a stationary truck of mass $12000 \mathrm{kg}$. The collision takes $4.0 \mathrm{s}$ and the two trucks move together at the same velocity after the collision. What is the average force that acts on the $8000 \mathrm{kg}$ truck during the collision?

(A) $2000 \mathrm{N}$

(B) $3000 \mathrm{N}$ 

(C) $5000 \mathrm{N}$

(D) $12000 \mathrm{N}$

An object has mass $2.0\pm 0.2 \mathrm{kg}$ and a velocity of $10\pm 1 \mathrm{m}{\mathrm{s}}^{-1}$. What is the percentage uncertainty in the momentum of the object?

(A) $1\%$

(B) $6\%$

(C) $10\%$

(D) $20\%$

A ball of mass $2.0 \mathrm{kg}$, moving at $3.0 \mathrm{m}{\mathrm{s}}^{-1}$, strikes a wall and rebounds with almost exactly the same speed. State and explain whether there is a change in

(a) The momentum of the ball

A ball of mass $2.0 \mathrm{kg}$, moving at $3.0 \mathrm{m}{\mathrm{s}}^{-1}$, strikes a wall and rebounds with almost exactly the same speed. State and explain whether there is a change in

(b) The kinetic energy of the ball.

(a) Define linear momentum.

 Determine the base units of linear momentum in the SI system.