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4. A train engine can exert a maximum pulling force. of Fmax By what factor would the resulting maximum acceleration differ if the mass of an entire single- engine train were tripled while the number of pulling engines, each pulling Fmax, doubled? Assume friction is negligible.
(A) 1
(B)2/3
(C)1/3
(D)3/2
(E) 2

Sagot :

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