A Porsche 914 accelerates uniformly from 0 to 60 miles per hour in 5 seconds.?

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A Porsche 914 accelerates uniformly from 0 to 60 miles per hour in 5 seconds.
Assuming a frictionless air track and a glider mass of 550 grams, find the mass M2 that one
must hang from the glider in order to obtain an acceleration equal to that of the Porsche.
 
this question is confusing. Acceleration is independent of mass so changing the mass wont affect the acceleration.
 
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