5,400
3,500 N.
The force needed to accelerate an object at some rate is proportional to the object's mass.The object may be moved by as small a force as you want. It just won't accelerate at a very high rate.
B. 5,400 N
90 n is needed to accelerate your body at a rate of 2 if you weigh 45 kg.
An increase in applied force will cause the object to accelerate.
C. 648 n
45,872
20N - Apex :)
Ignoring friction and air resistance, it would require a force of 30 Newtons.
648 N
44,896 N
38,064 N