John carries a 5 kg bag horizontally to the checkout line. How much work must he do to move it 8 m at a constant velocity of 1 m/s to the right?

Zeros that follow non-zeros numbers and are also to the right of a decimal point are significant

Imagine that someone pushes one marble toward a motionless marble. would there still be action-reaction forces involved in the collision? how might the marbles’ motions be changed? ?

This is the substance(s) formed in a chemical reaction.