Question

22.
A force of 15 N gives a mass m, an acceleration of 3 m/sec2 and mass m, an acceleration of
5 m/sec2. What acceleration would it give if both the masses were tied together ?
(1) 3 m/sec2
(2) 5 m/sec
(3) 4 m/sec?
(4) None of these
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Answer 1

here is your answer mate

Answer 2

f=ma

15 = 3×m

m= 5

f2= 5×m

m2=3

f1+f2= m1@+ m2a

30= (5+8)a

a=3.75m/sec2