A0.9 kg rock is projected from the edge of the top of a building with an initial velocity of 10.7 m/s at an angle 54° above the horizontal. due to gravity, the rock strikes the ground at a horizontal distance of 16.8 m from the base of the building. how tall is the building? assume the ground is level and the side of the building is vertical. the acceleration of gravity is 9.8 m/s^2. answer in units of m.

Two particles of masses m and 2m are placed on a smooth horizontal table. a string, which joins these two masses, hangs over the edge supporting a pulley, which suspends a particle of mass 3m. the pulley has negligible mass. the two parts of the string on the table are parallel and perpendicular to the edge of the table. the hanging parts of the string are vertical. find the acceleration of the particle of mass 3m.

Three charge are arranged as shown in the diagram. the magnitude of the net electrical force acting on the +6 uc charge, rounded to the tenths place, is .

Two objects of different mass start from rest, are pulled by the same magnitude net force, and are moved through the same distance. the work done on object 1 is 900 j. after the force has pulled each object, object 1 moves twice as fast as object 2. how much work is done on object 2?