A block weighing 2.5 kg is suspended from a hook in the ceiling ofa truck trailer by a hanging bungee cord. The cord has a crossisectional area 62 mm2 and an unstretched length of 31 cm. Part 1: Before Acceleration The truck begins stopped at a red light on a state highway. While stopped, the block hangs straight down to a distance 36 cm below the hook that attaches the bungee cord to the ceiling of the truck. (a) What is the spring constant of the cord? 11. During Acceleration After the light turns green, the truck begins to accelerate. As it does, the spring stretches to a length 41 cm. (b) What is the magnitude of the force on the block? The bungee cord stretches at an angle (the stretching is in the same direction as the cord, itself). The stretching can be broken down into components, horizontal and vertical based on the forces applied. (c) How much does the cord stretch in the z-direction? (d) What is the direction of the cord form the block to the hook? E = :t + E 2 [f] What is the acceleration of the truck in order to suspend the block in this direction? ) A (g) What is the position of the block with the hook as the origin? sa::v+:z 111. After Acceleration [h] When the truck reaches its cruising speed of 20 mfs, what is the position of the opposite end of the bungee cord with respect to the hook