Question

When Object A collides with object B and bounces back, its final momentum is ____ its initial momentum.

A. Greater than B. less than C. In the same direction as D. in the opposite direction of

Answer 1

B...Because the condition of object A is no velocity or force exerted on it

Answer 2

The answer depends on the type of the collision. If there is no energy lost the total momentum of the system is preserved. Having that said, for the individual elements of the system you have to know the exact details of the problem.

Answer 3

i agree....the information for this question is not enough

Answer 4

Momentum is always conserved. It does not depend on the type of collision, so put aside the notion that energy "losses" [sic] need to be considered. The total momentum of the system will be conserved before and after the collision, regardless of whether the collision is elastic or inelastic. Momentum is always conserved.\[\begin{align*} \vec{\rho}_{total~initial } & = \vec{\rho}_{total~final } \\ m_1\vec{v}_1 + m_2\vec{v}_2 &= m_1\vec{v}^f_1 + m_2\vec{v}^f_2\end{align*}\] The only thing that can be said for certain in the situation described by the problem, is that colliding object A bounces back, so its final velocity will be in the opposite direction (negative) compared to its initial velocity. Not enough information is provided to determine how the magnitude of the velocity may have changed, but knowing that the direction of the velocity has reversed, it can be determined that the final momentum of object A will be negative, or in the opposite direction of the initial velocity. The correct choice is D.

Answer 5

sorry for the energy loss that I mentioned. The momentum is conserved regardless. Sorry again!