describe what happens if you are writing down hill in a shopping cart which of newtons law is this governed by

Find v(t), given acceleration a(t)=7j and initial velocity v(0)=k

What ia the energy of an object because of its potential and kinetic energies

1. explain how you calculate the net force in any direction on the box. 2. suppose an upward force of 15n is added to the box. what will be the net vertical force on the box? 3. what force could be applied to the box to make the net force in the horizontal direction zero? explain. 4. suppose a force of 25n to the right is added to the box. what will be the net force to the right?