Chang sees the following formula on a website about Newton's second law.
What does the symbol EF in the formula indicate that
Chang needs to do?
ΣΕ
a =
m
He needs to find the net force acting on the object in a
direction.
He needs to use only forces acting in the direction of
motion.
He needs to combine the horizontal and vertical
forces.
He needs to multiply the horizontal and vertical
forces.

As you are trying to move a heavy box of mass m, you realize that it is too heavy for you to lift by yourself. there is no one around to , so you attach an ideal pulley to the box and a massless rope to the ceiling, which you wrap around the pulley. you pull up on the rope to lift the box. use g for the magnitude of the acceleration due to gravity and neglect friction forces. once you have pulled hard enough to start the box moving upward, what is the magnitude f of the upward force you must apply to the rope to start raising the box with constant velocity? express the magnitude of the force in terms of m, the mass of the box.

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An object dropped from cliff falls with a constant acceleration of 10 metre per second square find its speed of two seconds after it was dropped