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KCET 2017 Physics Solved Paper
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© examsnet.com
Question : 7
Total: 60
Two balls are thrown simultaneously in air.The acceleration of the centre of mass of the two balls when in air,
depends on the masses of the two balls
depends on the speeds of the two balls
is equal to g (Acceleration due to gravity)
depends on the direction of motion of the two balls.
Validate
Solution:
Acceleration of centre of mass
=
m
1
(
−
g
)
+
m
2
(
−
g
)
m
1
+
m
2
=
−
g
(
m
1
+
m
2
)
(
m
1
+
m
2
)
=
−
g
Therefore, acceleration of centre of mass of two balls in air is equal to g, that is, acceleration due to gravity
© examsnet.com
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