A ball of mass m kg moving with a speed v strikes a wall at an angle thita with the wall and rebounds with same speed and same angle. what is its change in momentum?
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Answer:
Let the object strikes the wall at an angle θ.
Momentum when object hits ball is p
1
=mvsinθ
i
^
−mvcosθ
j
^
when it rebounds at same speed & same angle, p
2
=mvsinθ
i
^
+mvcosθ
j
^
Change in momentum =p
2
−p
1
=mvsinθ
i
^
+mvcosθ
j
^
−(mvsinθ
i
^
−mvcosθ
j
^
)
Δ
p
=2mvcosθ
j
^
j
^
is the unit vector along y− direction.
Magnitude of Δ
p
=2mvcosθ
hope it helps u mate
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