A bow and arrow is used to demonstrate physics concepts. The spring constant of the bow is 280 N/m and is pulled back a distance of 10 cm when
launching the 0.9 kg arrow. The arrow is shot directly into the side of a 1.2 kg
box (on a table) and sticks in it. If the box and arrow come to a stop in 20 cm
what is the force of friction between the table and box? How much work did friction do in stopping the box ?