Astudent standing on the ground next to a tall building throws a ball straight up with a speed of 39.2 m/s. if it takes the ball 4 seconds to reach the same height as the top of the building, how tall is the building?

An ideal otto cycle has a compression ratio of 10.5, takes in air at 90 kpa and 40°c, and is repeated 2500 times per minute. using constant specific heats at room temperature, determine the thermal efficiency of this cycle and the rate of heat input if the cycle is to produce 90 kw of power.