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4-1.Newton's Laws of Motion
easy
A ball is moving towards the wall as shown in diagram then its momentum is conserved
A
Along the wall
B
Along the perpendicular to the wall
C
Along any direction
D
Both $(a)$ and $(b)$
Solution
(a)
$P_i=-m v \sin \theta \hat{\jmath}+m v \cos \theta \hat{\imath}$
$P_f=-m v \sin \theta \hat{\jmath}-m v \cos \theta \hat{\imath}$
$y$ dieetion $\Rightarrow$ momemtum $\rightarrow$ same
$P_{1 y}=$ Pfy $\Rightarrow y$ dorection $\rightarrow$ mememtum conserce $y$ is along the wall
Standard 11
Physics
