Question

Two 0.20-kg balls, moving at 4 m/s east, strike a wall. Ball A bounces backwards at the same speed. Ball B stops. Which statement correctly describes the change in momentum of the two balls?

a. |ΔpBl<|ΔPA|
b. |ΔpBl=|ΔPA|
c. |ΔpB|>|ΔPA|
d. ΔpB > ΔPA

Answer 1

Option A

Step-by-step explanation:

From the question we are told that:

Mass
`m=0.20kg`

Velocity
`v=4m/s`

Generally the equation for momentum for Ball A is mathematically given by

Initial Momentum

`M_(a1)=mV`

`M_(a1)=0.2*4`

`M_(a1)=0.8`

Final Momentum

`M_(a2)=-0.8kgm/s`

Therefore

`\triangle M_a=-1.6kgm/s`

Generally the equation for momentum for Ball B is mathematically given by

Initial Momentum

`M_(b1)=mV`

`M_(b1)=0.2*4`

`M_(b1)=0.8`

Final Momentum

`M_(b2)=-0 kgm/s`

Therefore

`|\triangle M_a|>|\triangle Mb|`

Option A