Q5:

If vmt ≠ 0, is v²m³t^-4 > 0?

(1) m > v²

(2) m > t^-4

^{i think this problem is dependent on the m,if m>0,then the function is >0,if m<0,then the function is <0.but in this case ,we all can get m>0,so the answer is d,is it right?}