In the figure below, a 3.4 kg box of running shoes slides on a horizontal fricti
ID: 2197628 • Letter: I
Question
In the figure below, a3.4kg box of running shoes slides on a horizontal frictionless table and collides with a2.7kg box of ballet slippers initially at rest on the edge of the table, at heighth= 0.40 m. The speed of the3.4kg box is5.0m/s just before the collision. If the two boxes stick together because of packing tape on their sides, what is their kinetic energy just before they strike the floor?
Explanation / Answer
conservation of momentum 3.4*5=(3.4+2.7)*v v=2.78 m/s conservation of energy 0.5*6.1*2.78^2+6.1*9.81*0.4=ke ke=47.5j