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4-1.Newton's Laws of Motion
easy
A body at rest explodes into two pieces of unequal mass. The parts will move
A
Arbitrarily
B
In the same direction
C
In opposite directions with equal speeds
D
In opposite directions with unequal speeds
Solution
(d)
$\because$ momentum is conserved
$P _{ i } \overrightarrow{=0}$
$P _{ f }= m _{ f ( A )} V _{( A )}+ m _{ f ( B )} V _{( B )}=0$
$m _{ f ( A )} V _{( A )}^{\overrightarrow{ A }}=- m _{ f ( B )} V \underset{( B )}{\overrightarrow{ }}$
both move in opposite directions
$\because m _{ f ( B )} \equiv m _{ f ( A )}$
$V _{\vec{A}} \equiv V _{\vec{B}}$
Standard 11
Physics
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