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7. Two bodies of mass 3 kg and 4 kg are suspended at the ends of massless string passing over a frictionless pulley. The acceleration of the system is (g = 9.8 m/s  ^ 2 

(a)  4.9 m/s 2                                      (b) 2.45 m/s 2

(c)   1.4 m/s 2                          (d) 9.5 m/s 2

Ans. c

(14)

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