Two 020-Kg Balls,moving at 4 M/s East,strike a Wall $\left| \Delta \overrightarrow { \mathbf { p } } _ { B } \right| < \left| \Delta \overrightarrow { \mathbf { p } } _ { \mathrm { A } } \right|$

Multiple Choice

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) $\left| \Delta \overrightarrow { \mathbf { p } } _ { B } \right| < \left| \Delta \overrightarrow { \mathbf { p } } _ { \mathrm { A } } \right|$ .
B) $\left| \Delta \overrightarrow { \mathbf { p } } _ { B } \right| = \left| \Delta \overrightarrow { \mathbf { p } } _ { \mathrm { A } } \right|$ .
C) $\left| \Delta \overrightarrow { \mathbf { p } } _ { B } \right| > \left| \Delta \overrightarrow { \mathbf { p } } _ { \mathrm { A } } \right|$ .
D) $\Delta$ $\overrightarrow { \mathbf { p } }$ _B = $\Delta$$\overrightarrow { \mathbf { p } }$ _A.
E) $\Delta$ $\overrightarrow { \mathbf { p } }$ _B > $\Delta$ $\overrightarrow { \mathbf { p } }$ _A.