vertical

Where required take g=9.8ms-2 7)A post of mass 3kg is pushed downwards by a force 300 N and experiences resisting forces of 325N form the ground. Find the accelration of the post. Heres how i tried to work it out. using f=ma 300+9.8=309.8 325-309.8=3xa 15.2=3 x a 15.2/3=a a=5.06ms-2 wrong...