SECTION - B(Attempted any 20 questions) 0.21) A force of S N gives a mass m, an acceleration of 10 ms and mass my an acceleration of 20 ms. What acceleration would if give it both the masses were tied together? a) 7.65 ms b) 700 ms c) None of these d) 6.67 ms
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Class 11
>>Physics
>>Laws of Motion
>>Newton's Second Law of Motion
>>A force of 5 N gives a mass m1 . an acce
Question
A force of 5 N gives a mass m
1
. an acceleration of 10 m s
−2
and a mass m
2
. an acceleration of 20 m s
−2
. What acceleration would it give if both the masses were tied together?
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Solution
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For mass m
1
newton 2nd law
F=m
1
a
1
5=m
1
×10
m
1
=
2
1
kg
For mass m
2
F=m
2
a
2
5=m
2
×20
m
2
=
4
1
kg
if tied together
Total mass =m
1
+m
2
=
2
1
+
4
1
=
4
3
kg
Now
F=M
T
Q
T
a
T
=
m
T
5
=
3
5×4
=
3
20
m/s
2
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