Newton's second law is often stated as F=ma, which means the force (F) acting on an object is equal to the mass (m) of an object times its acceleration (a). This means the more mass an object has, the more force you need to accelerate it.
Shadow 24 answered this
F=MA BECAUSE OF NEWTONS SECOND LAW. THIS IS RELATED TO MOMENTUM AND ANSWER IS IN THE BOOK SOMEWHERE.