Jody konchute holds a 3kg air rifle and fires a projectile of mass 0.5 g. the speed of the projectile is 100 m/s . what is the recoil speed of the air rifle, if it's not held tightly? is she holds tightly the speed is less. explain. calculate recoil speed assuming girl has mass of 52 kg.(show work)

Which statement is true? a) the work done to lift an object 6 meters is greater than the gravitational potential energy it gains. b) the work required to push an object is less than the work required to pull an object the same distance. c) the work required to raise an object to a height is equal to the gravitational potential energy the object gains. d) the work done against gravity to lift an object straight up is greater than the work required to roll it up a ramp.