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Q.

A net force of 200 N gives a body of mass m1 an acceleration of 80ms-2 and a body of mass m2 , an acceleration of 240ms-2 . The acceleration that this force caused when the masses combine together is

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a

120 ms -2

b

100 ms -2

c

60 ms -2

d

50 ms -2

answer is B.

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Detailed Solution

We know that F = ma
∴200=m1×80⇒m1=20080=2.5kg
and 200=m2×240⇒m2=200240=0.833kg
When joined together, m=m1+m2=206kg
Final acceleration is
a=Fm=20020/6=60ms−2

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