1. A person pulls a 3.1 kg crate 1.6m along a horizontal floor by a constant force Fp= 8.1 N which acts at a 5.8 degree angle. The floor is rough and exerts a friction force Ffr= 7.4 N Determine the work done by the Fp 2. A car traveling 6.4 km/h can brake to a stop in a distance d of 16 m. If the car is going 127 km/h what is its stopping distance? Assume the maximum braking force is approximately independent of speed. 3. A car traveling 79 km/h can brake to a stop in a distance of 12 m. If the car is going 124 km/h what is its stopping distance? Assume the maximum braking force is approximately independent of speed. 4. Determine the PEg of a 5.46 kg bowling ball raised 2.43 m off the floor while standing in an air balloon 13.9 km in the sky