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Q1. A 458 Winchester magnum cartridge has a 500 grain (1gr=.0648g) bullet that attains a muzzle speed of 644.90 m/s. After travelling 456 m, it would still be moving at 365.60 m/s. What fraction of its original KE does it have at the distance?

Q2. A runner of mass m = 39kg and running at 3.1m/s runs as shown and jumps on the rim of a playground merry-go-round which has a moment of inertia of 372 kg•m2 and the radius of 2 meters. Assume the merry-go-round is initially at rest, what is its final angular velocity to three decimal places?

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