Please choose all that are correct Select one or more: a. a ball thrown straight up in the air has zero translational kinetic energy when it reaches maximum height b. The work done by the force of gravity on a bag groceries when the groceries are carried up the stairs is zero O c. in every frictionless case, mechanical energy is conserved d. at the end of their exercising, a weight-lifter at the gym has done no total work on the weights е. No net work is done when a crate is dragged around on the floor, as long as the crate ends up in the same location f. nonconservative forces are called liberal forces g. when 2 students are placed at the same height, the heavier student has more gravitational potential energy h. friction is a type of a nonconservative force

Please choose all that are correct Select one or more: a. a ball thrown straight up in the air has zero translational kinetic energy when it reaches maximum height b. The work done by the force of gravity on a bag groceries when the groceries are carried up the stairs is zero O c. in every frictionless case, mechanical energy is conserved d. at the end of their exercising, a weight-lifter at the gym has done no total work on the weights е. No net work is done when a crate is dragged around on the floor, as long as the crate ends up in the same location f. nonconservative forces are called liberal forces g. when 2 students are placed at the same height, the heavier student has more gravitational potential energy h. friction is a type of a nonconservative force