Hello,

From the basics of mechanics we know that the force on the body is equal to the mass of the body multiplied with the acceleration of the body. So F=M*A.

CASE 1

for 5kg mass at 5m/s^2 acceleration

according to the formula force= Mass * Acceleration ( F=M*A )

we get Force= 5*5= 25N

CASE 2

for 6kg mass at 3m/s^2 acceleration

according to the formula force= Mass * Acceleration ( F=M*A )

we get Force= 6*3= 18N

So clearly we can see the for 5kg mass at 5m/s^2 acceleration  we need more force than for 6kg mass at 3m/s^2 acceleration