1. A car moving at 15 m/s skids to a stop in 20 m. If the cartravels at 45m/s , how far will skid, assuming the same constantbraking force?

2. The Navy wants a new airplane launcher for their aircraftcarriers and you are on the design team. The launcher iseffectively a large spring that pushes the plane for the first 5meters of the 20 meter long runway. During that same time, theplane's jet engines supply a constant thrust of 5.4x10^4 N for theentire length of the runway. The 2000 kg planes need to have avelocity of 45'm/s by the end of the runway. What shouldbe the spring constant for the launcher?

3. Calculate the kinetic energy of the earth as it makes onrevolution around the sun.

4. Hulky and Bulky, two UPS workers, decide to race each other upa flight of stairs (h=4.0m) at the warehouse. Hulky, whose mass is120 kg, makes the climb in 3.0 s; while Bulky, 150 kg, took 4.0 Sto make the climb.
a) who has more Eg ( gravity ) at the top?
b) who exerted more power getting there?