Hakeem throws a 9.5 g ball straight down from a height of 2.0 m. The ball strikes the floor at a speed of 7.3 m/s. What was the initial speed of the ball

What object a collides with object b and bounces back its final momentum is?

What is the temperature in degrees celsius of a substance with a tempature of 49k

Air is contained in a variable-load piston-cylinder device equipped with a paddle wheel. initially, air is at 400 kpa and 17°c. the paddle wheel is now turned by an external electric motor until 75 kj/kg of work has been transferred to air. during this process, heat is transferred to maintain a constant air temperature while allowing the gas volume to triple. calculate the required amount of heat transfer in kj/kg.