Question

What force is required to produce an acceleration of 3m/s2 of an object of mass 0.7 kg

Answer 1

force = mass×acceleration
F=0.7×3
=2.1N

Answer 2

Hi Friend, 
Use the formula,
F=ma
Given m=0.7kg
           a=$3m/s^{2}$
The Answer is:
0.7kg x 3m/$s^{2}$
⇒2.1 dyne cm.