Q1. The driver of a truck slams on the brakes when he sees a tree blocking the road. The truck slows down uniformly with acceleration -5.25m/s2 for 4.20 s, making skid marks 62.70 m long that end at the tree. With what speed does truck after that strike the tree?

Q2. A 2kg lunchbox is sent sliding over a frictionless surface, in positive direction of an x axis along the surface. Start at time t = 0, steady wind pushes on the lunchbox in the negative direction of the x axis. The position x of the lunchbox as a function of time t as the wind pushes on the lunchbox. From the graph, estimation the kinetic energy of the lunchbox at (a) t = 1.0 s and (b) t = 5.0 s. (c) How much work does the force from the wind do on the lunchbox from t = 1.0 s to t = 5.0 s?