A 50 kg boy runs up a flight of stairs 12 m high in 6 seconds. What is his power output?

An airplane dives at 80 km/hr at an angle of 30 degrees below the horizontal. When it is 1000m above the ground, a mass was released from the plane. Find the time taken for the mass to hit the ground?

A point charge of -2.0 µC is located at the origin. A second point charge of 15 µC is at x = 1 m, y = 0.5 m. Find the x and y coordinates of the position at which an electron would be in equilibrium. X = m y = m

A mail bag with a mass of 120 kilogram is suspended by a vertical rope 6.0 meters long. What horizontal force is necessary to hold the bag in a position displaced sideways 3.0 meters from its initial position?