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1. A student throws a softball horizontally from a dorm window 15 meters above the ground. Another student standing 10 meters away from the dorm catches the ball at a height of 1.5 meters above the ground. What is the initial velocity of the ball? i - 2. A hose lying on the ground shoots a stream of water upward at an angle of 40 from the horizontal. The speed of the water is 20 m/s as it leaves the hose. How high up will strike the wall which is 8 meters away? .". 3. A force of 100 N pulls an 8 kg block horizontally across the floor. If the coefficient of kinetic friction between the block and the floor is 0.2, find the acceleration of the block. .. 8 kg P = 100 N HK = 0.24. A 30-kg mass rests on a 37 inclined plane. The coefficient of kinetic friction is 0.3. A push P parallel to the plane and directed up the plane causes the mass to accelerate at 3 m/s as shown in the figure. a) What is the normal force? b) What is the frictional force? c) What is the resultant force up the plane? d) What is the magnitude of the push P? . P a 30 kg 37 5. A horizontal force of 12 N acts on an object resting on a level, frictionless surface on the moon, where the object has a weight of 98 N a) what is the magnitude of the acceleration of the object? b) What would be the acceleration of the same object in a similar situation on earth