Question: 1. A ball is thrown vertically upward from a window that is 3.6 m above the ground. Its initial speed is 2.8 m/s. With

1. A ball is thrown vertically upward from a window that is

1. A ball is thrown vertically upward from a window that is 3.6 m above the ground. Its initial speed is 2.8 m/s. With what speed does the ball hit the ground? [4 marks] 2. A 23-kg block is pushed with a 50 N force up a slope that is at a angle to the ground. The coefficient of friction for the slope is 0.25. Calculate the value of the force of friction. [3 marks] 3. Two masses, 4.0 kg and 6.0 kg, are connected by a mass less rope over a "frictionless" pulley as pictured in the diagram. The ramp is inclined at 30.0 and the coefficient of kinetic friction on the ramp is 0.18. [6 marks] 4.0 kg Pk 0.18 6.0 kg 300 (a) Determine the acceleration of the 6 kg mass once it begins to move. (b) Determine the tension in the rope.

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