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# Angle after Glancing: Two-Dimensional Collision

APPHMC-FZKYL1

A block of mass $m$ moving with speed $v$ collides elastically with another block of mass $m$ at rest. Right after the collision the first block travels at an angle of $30^{\circ}$ to the $x$-axis.

The angle made by the second block with the $x$-axis is

A

$30^{\circ}$

B

$45^{\circ}$

C

$60^{\circ}$

D

$75^{\circ}$

E

It cannot be determined from the information given.