question 1:

Luke sees a Coke can on the floor and kicks it. The coefficient of friction between the floor and the can is 0.25. If he gives the can an initial velocity of 21 m/s, how far did the can go?

question 2:

After learning about pulleys in Physics class, Daniel (72 kg) and Karol (61 kg) decide to try out some crazy stunts for their YouTube channel. They rig a pulley system on top of Daniel's minivan. Daniel to lies on top of the van holding a rope that goes around the pulley and straight down the back door. Karol hangs on the rope with his whole weight so that Daniel flies off the van and lands in a pile of leaves some distance away. To add more weight, Karol decides to hang an 8.0 kg backpack off his foot.

a) What is Daniel's acceleration across the top of the van, if the coefficient of kinetic friction between the van and Daniel is 0.30?

b) Karol's backpack strap is capable of withstanding 90 N. Does his backpack break?