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1. A cannonball is fired at an elevation of 5.1 ° with a muzzle velocity of 450 m/s. How long does it take before it strikes the ground? 2. A block of copper has a mass of 50 kg and a density of 8.91 g/cm3. If the block is to be converted into a cylinder, find the diameter of the cylinder if the length is 1500 cm. 3. A crate with a mass of 65 kg lies on a horizontal surface. A force is applied horizontally until the crate starts to move. Determine the crate's initial acceleration. The coefficient of static friction between the floor and the crate is 0.76 while coefficient of kinetic friction is 0.51. 4. A train is travelling initially at 10 m/s. It accelerates at 1.04 m/s^2 for 20 s before it reaches a speed of 30.8 m/s. At the end of this time, how far is it from the starting point? 5. A 75 kg block on the floor is being pulled by a 120 N force at 30° with the horizontal. Find its acceleration. 6. A 10,000 g block is lifted 787 in. above the ground in a gravitational field, its gravitational potential energy after it has been lifted 787 in is?