Answer :

Krutik
to find acceleration you divide the force by the mass. So 4500 divided by 1500 is 3 Also you put m/s/s behind the answer so the answer is 3 m/s/s
AL2006
.
Newton's 2nd law of motion says:     Force= (mass) x (acceleration)

You know the force and the mass, and you need to find the acceleration.
So divide each side of the formula by  (mass). 
Then you have:

       (force) / (mass) = acceleration .

Write the quantities that you know in their places,
and bada-bing, out falls the answer you need.