How long is the ball "in flight"

Reference no: EM1314831

Q1. A ball is thrown from the top of a building upward at an angle of 48degrees to the horizontal and with an initial speed of 28m/s. The ball is thrown at a height of 31m above the ground. How long is the ball "in flight" if the acceleration do to gravity is 9.80 m/s^2.

Q2. A frictionless pulley has the shape of a uniform solid disk of mass 4.00 kg and radius 28.0cm. A 3.60 kg stone is attached to a very light wire that is wrapped around the rim of the pulley, and the stone is released from rest. As it falls down, the wire unwinds without stretching or slipping, causing the pulley to rotate. How far should the stone fall so that the pulley has 2.75 J of kinetic energy?

Reference no: EM1314831

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