F = m*a
If we separate this into two differents plane we have the following:
Plane 1: F1 = m1*a1
Plane 2: F2 = m2*a2
However, the Force is constant so F1 = F2, and m2 = 1/2m1, for plane 2 then:
F1 = 1/2m1*a2
2F1/m1 = a2
Then, from the first equation: F1 = m1*a1 ----> m1 = F1/a1, where a1 = 6.5 m/s2 then:
2F1xa1/F1 = a2
a2 = 2a1 = 2*6.5
a2 = 13 m/s2 This would be the correct answer.
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